Scientists at IBM used scanning tunnelling microscopy to write the initials of their corporation using 35 individual xenon atoms. The mass of the xenon atom is 7.631 x 10⁻²¹ g
The concept involved in the given problem is mass conversion. The mass conversion establishes connections between grams, moles and atoms. Mole can be used to relate mass of substance to the number of atoms.
Mole is the chemical unit to express the amount of a substance. One mole consists of Avogadro’s number of atoms that is
6.022 x 10²³ atoms
1 mol = 6.022 x 10²³ atoms
The Avogadro’s number acts as a conversion factor between the number of atoms and the number of moles.
The number of moles of a substance can be calculated using following formula:
Number of moles = Number of atoms divided by Avogadro number
The moles of a substance can be converted to grams of the substance using the following formula:
Grams = Moles x Atomic mass
Step: 1
Calculate the moles of Xe atoms by using the relation as follows:
Number of moles = Number of atoms divided by Avogadro number
Thus,
mol of Xe = number of atoms / Avogadro number
= 35/6.022x10²³
= 5.812 x 10⁻²³ mol
Explanation:
The Avogadro’s number acts as a conversion factor between number of atoms and moles. So, divide the number of atoms by Avogadro’s number to get the moles of Xe atoms.
Hint:
Convert the moles of Xe to grams.
Step: 2
Calculate the total mass of letters from the moles of Xe using the following relation:
Grams of Xe = (Moles of Xe) x (Atomic mass of Xe)
=(5.812 x 10⁻²³ mol) x (131.29 gmol⁻¹)
= 7.631 x 10⁻²¹ g Xe
Mole of a substance relates mass of substance to the number of atoms. Convert the number of atoms to moles of Xe using Avogadro’s number. Then convert moles to grams of Xe atoms by multiplying moles with atomic mass of Xe.
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the process of separating na and cl- against coulomb attractive force is . group of answer choices endothermic not enough information exothermic
The process of separating Na+ and Cl- against coulomb attractive force is :
Endothermic.
This is because it takes energy to counteract the attraction between the oppositely charged ions while separating Na+ and Cl- ions against Coulomb attractive force. The amount of energy needed to separate the ions is dictated by the intensity of their attraction, which is determined by the size of their charges and the distance between them. The greater the charge and the closer the ions, the greater the amount of energy necessary to separate them.
An endothermic process is one that absorbs energy in the form of heat. This sort of reaction requires an energy input, generally in the form of heat, to proceed. Endothermic processes include the combustion of fuels, the dissolution of salts, and the neutralisation of acids and bases.
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CH₂O
Empirical
Formula Mass
Answer: 32 atomic mass units
Explanation:
carbon is 14
hydrogen is 1 each
oxygen is 16
if 0.25 mol of br2 and 0.25 mol of cl2 are introduced into a 3.0 l container at 400 k, what is the equilibrium concentration (in m) of brcl?
Introducing 0.25 mol of br2 and 0.25 mol of cl2 into a 3.0 l container at 400 k results in the 0.096 M of equilibrium concentration of BrCl
The reaction for the formation of BrCl from Br2 and Cl2 is:
Br2(g) + Cl2(g) ⇌ 2BrCl(g)
The equilibrium constant expression for the above reaction is:
Kc = ([[tex]BrCl^{2}[/tex]]) / ([Br2][Cl2])
where [BrCl], [Br2], and [Cl2] are the equilibrium concentrations of the respective species in the reaction.
Since we have 0.25 mol of both Br2 and Cl2 in a 3.0 L container, the initial concentration of each is:
[Br2] = 0.25 mol / 3.0 L = 0.083 M
[Cl2] = 0.25 mol / 3.0 L = 0.083 M
At equilibrium, let's assume that the concentration of BrCl is x M. Therefore, the equilibrium concentration of Br2 and Cl2 will be (0.083 - x) M, since each mole of Br2 and Cl2 produces 2 moles of BrCl.
Kc = ([[tex]BrCl^{2}[/tex]]) / ([Br2][Cl2])
At equilibrium, Kc will have a certain value at the given temperature. For this problem, let's assume Kc =2.0 x [tex]10^{-2}[/tex] (which is an estimated value based on literature values at 400 K). Solving for x, we get:
2.0 x [tex]10^{-2}[/tex] = [tex]x^{2}[/tex] / [[tex](0.083 - x)^{2}[/tex]]
x = 0.096 M
Therefore, the equilibrium concentration of BrCl is 0.096 M.
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Can an element in the activity series replace any element?
Yes, an element in the activity series can replace only an element placed below it.
When we look at the activity series, we can observe that nickel is positioned above lead but below iron. As a result, while iron cannot be replaced by nickel metal, lead can be replaced by it in a reaction. Thus, an element can replace another element placed below it in the activity series.
Only when the element being replaced is more reactive than the other element, single-replacement reactions take place. Consequently, having a list of the elements arranged according to their relative reactivity is helpful. The elements in the activity series are listed in decreasing order of how reactive they are.
Metals and nonmetals each have their own activity series because metals replace other metals while nonmetals replace other nonmetals.
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select copper(i) oxide, cu2o. note that cu2o is a compound composed of different types of atoms bonded together. place the cu2o formula unit on the nano-balance. (a formula unit of cu2o consists of two copper atoms and one oxygen atom.) formula mass is the average mass of one formula unit, measured in unified mass units (u). what is the formula mass of cu2o? add formula units to the larger balance until its reading matches that of the nano-balance exactly. how many formula units did you need to add? repeat the above procedure with another compound of your choice. how many formula units did you need to add?
We must first determine the formula mass of a Cu2O formula unit before we can set it on the nano-balance. As a result, we must increase the greater balance by one formula unit of H2O.
We must first determine the formula mass of a Cu2O formula unit before we can set it on the nano-balance. Since there are two copper atoms and one oxygen atom in every unit of the formula Cu2O, we may determine its mass as follows: Cu2O has a formula mass of 143.1 u, which is equal to 2 atomic masses of copper and 1 atomic mass of oxygen. 0.000 u x 143.1 u/formula unit = 0 formula units is the amount we must increase. The mass of water is expressed as: H2O's formula mass is (2 x hydrogen atomic mass) + (1 x oxygen atomic mass), which equals (2 x 1.008 u) + (1 x 15.999 u) = 18.015 u. The following must be added: 0.000 u; 18.015 u; and 0.000 formula units.
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f the volume of the reaction vessel in the previous part was 1.25 l , what amount of br2 (in moles) was formed during the first 15.0 s of the reaction?
The amount of the Br₂ in moles was formed during the first 15.0 s of the reaction is 0.0396 mol.
The rection is as :
2HBr ---> H₂ + Br₂
The rate of disappearance of HBr = - (1/2) d[HBr] / dt
The rate of formation of H₂ = + (1/ 2 )d [H₂ ] / dt
The rate of formation of Br₂ = + (1/2) [ Br₂] / dt
Average rate = - (1/2) d[HBr] / dt
= - (1/2) ( 0.512 - 0.600 ) / (25 - 0 )
= 0.00176 M/s
d[ Br₂] / dt = 0.00176 M/s
[ Br₂] = 0.0264 M
The moles of Br₂ = 0.0264 × 1.25
= 0.0396 mol
This question is incomplete, the complete question is :
Consider the reaction. 2 HBr(g) ¡ H2(g) + Br2(g) a. Express the rate of the reaction in terms of the change in concentration of each of the reactants and products. b. In the first 25.0 s of this reaction, the concentration of HBr drops from 0.600 M to 0.512 M. Calculate the average rate of the reaction during this time interval.c. If the volume of the reaction vessel in part b is 1.50 L, what amount of Br2 (in moles) forms during the first 15.0 s of the reaction?
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Give the valencies of the anion and cation in aluminum nitrate
Answer:
+3
Explanation:
The anion in aluminum nitrate is nitrate (NO3-), which has a valency of -1. The cation in aluminum nitrate is aluminum (Al^3+), which has a valency of +3.
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when looking at anisole (methoxybenzene), shown below, the methoxy group is inductively electron-withdrawing because oxygen is more electronegative than carbon. however, the resonance structures indicate the methoxy group donates electron density to the ring. when there is competition between induction and resonance, such as in this case, which force is generally more dominant?
When there is competition between the inductive effect and resonance effect, the resonance effect is generally more dominant in determining the electronic properties of a molecule.
This is because resonance allows for the delocalization of electrons, resulting in more stable molecules and enhanced reactivity.
The resonance effect is a chemical phenomenon in which electrons are delocalized through a system of adjacent atoms with conjugated pi bonds. This delocalization leads to the stabilization of the molecule, which can affect its reactivity and electronic properties. The resonance effect is typically observed in organic molecules with alternating double and single bonds, or in molecules with adjacent atoms with lone pairs. The delocalization of electrons through resonance can lead to a variety of interesting effects, including increased acidity or basicity, altered reactivity patterns, and changes in molecular orbital energies. The resonance effect is an important concept in many areas of chemistry, including organic synthesis, biochemistry, and materials science, and is often used to explain and predict the behavior of complex molecules.
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substance a has a density of 2.20 g/ml while substance b has a density of 1.10 g/ml. what volume of substance b has the same mass as 50.0 ml of substance a?
100 ml of substance b has the same mass as 50.0 ml of substance a.
To solve this problem, we need to use the formula:
density = mass/volume
We can rearrange this formula to solve for mass:
mass = density x volume
We can then use the masses of the two substances to find the volume of substance b that has the same mass as 50.0 ml of substance a.
First, let's find the mass of 50.0 ml of substance a:
mass of substance a = density of substance a x volume of substance a
= 2.20 g/ml x 50.0 ml
= 110 g
Next, let's find the volume of substance b that has the same mass as 50.0 ml of substance a by equating:
mass of substance b = mass of substance a
density of substance b x volume of substance b = density of substance a x volume of substance a
volume of substance b = (density of substance a x volume of substance a) / density of substance b
= (2.20 g/ml x 50.0 ml) / 1.10 g/ml
= 100 ml
Therefore, 100 ml of substance b has the same mass as 50.0 ml of substance a.
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3. Read the entire laboratory activity. Form a hypothesis
about what observable products will indicate that a
double-replacement reaction has gone to completion.
Record your hypothesis in the next column.
A possible hypothesis on the observable products indicating that the reaction has gone to completion could be:
In a double-replacement reaction, two ionic compounds will exchange their positive and negative ions to form new ionic compounds. The reaction can be considered complete when the formation of a solid precipitate, gas evolution, or a change in temperature or color is observed.What is a double-replacement reaction?A double-replacement reaction is a type of chemical reaction that occurs between two ionic compounds in which the cations and anions of the two compounds switch partners to form two new ionic compounds.
In other words, the cations of one compound exchange places with the anions of the other compound. The general form of a double-replacement reaction can be written as AB + CD -> AD + CB, where A and B are the cations of the two original compounds and C and D are the anions of the two original compounds.
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A house is colloed by an air conditioning system on a hot day. using the house as a system, describe the transfer of energy between the system and surrounding?
Answer:
Explanation:
In this scenario, the house can be considered as a thermodynamic system, and the transfer of energy between the system and its surroundings occurs through heat transfer.
On a hot day, the temperature inside the house is higher than the temperature outside, causing heat to flow from the house to the environment in order to balance the temperatures. This heat transfer occurs due to the difference in temperature between the house and the outside environment, and is facilitated by the air conditioning system.
The air conditioning system works by removing heat from inside the house and expelling it to the outside environment, thus cooling the air inside the house. This process of removing heat from the house and expelling it to the outside is a transfer of energy from the system (the house) to its surroundings.
The heat transfer from the house to the outside environment continues until the temperature inside the house reaches a state of thermal equilibrium with the temperature outside, at which point the transfer of heat stops. The air conditioning system continues to operate, however, to maintain the desired temperature inside the house by continuously removing heat and expelling it to the outside environment.
In summary, the transfer of energy between the house (the system) and its surroundings occurs through heat transfer, with heat flowing from the house to the outside environment due to the difference in temperature, and the air conditioning system facilitating this transfer by removing heat from inside the house and expelling it to the outside environment.
Exercise 6.76- Enhanced - with Feedback
MISSED THIS? Read Section 6.6. You can click on the
Review link to access the section in your eText.
Silver chloride, often used in silver plating, contains 75.27%
Ag.
Part A
Calculate the mass of silver chloride in grams required to make 4.4 g of silver plating
Express your answer using two significant figures.
196) ΑΣΦ
magci =
Submit
Provide Feedback
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g
Silver chloride, often used in silver plating, contains 75.27% Ag. 450mg is the mass of silver chloride in grams required to make 4.4 g of silver plating.
What is silver plating?Silver is stable in clean air and clean water, but tarnishes whenever subjected to ozone, hydrogen sulfide, especially sulfurous air. Silver is largely utilized in electroplating for industrial purposes, notably electrical connections.
1 mole of AgCl, 0.7527 mol of Ag present.
1 mol of Ag is obtained from 1/0.75mol of AgCl
number of moles = 4.4 g / 107.87=0.002mol
0.002364 mol of Ag will be obtained from 0.002mol/ 0.7527 =0.003 mol
mass = moles × molar mass
= 0.03 × 143.3=0.450g=450mg
Therefore, 450mg is the mass of silver chloride in grams required to make 4.4 g of silver plating.
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You are experimenting with blood samples and you place a drop of RBCs into a solution of 300 millimoles of CaCl2. What effect does this have on the RBCs?A.) The RBCs would shrink.B.) No effect on RBCs. This is an isotonic soution and there would be no net movement of water.C.) The RBCs would swell and burst.
The drop of RBCs placed in the 300 millimolar solution of CaCl2 would cause the RBCs to shrink. The answer is A) The RBCs would shrink.
This is because the solution is hypertonic, meaning it has a higher solute concentration than the RBCs. As a result, water will move out of the RBCs to try to equalize the concentration of solutes on both sides of the membrane. This will cause the RBCs to shrink in size as they lose water. The Ca2+ ions in the solution can also interact with the negatively charged phospholipid heads in the RBC membrane, causing the membrane to become more rigid and less flexible, further contributing to the shrinkage of the RBCs.
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What information would you find on a workplace label?
A workplace label typically contains information about the product name, manufacturer, safety instructions, and hazard warnings. It may also include instructions for proper use, storage, and disposal of the product.
What is the manufacturer?The manufacturer is the company or individual responsible for producing a product. They are responsible for the design, production, and distribution of the item. The manufacturer typically owns the production line, labor, and materials used to create the product. This includes the factory, the machinery, and the raw materials used to make the product. The manufacturer is also responsible for creating a brand identity, and for marketing and promoting the product. This includes advertising, creating a website and social media presence, and engaging in public relations activities.
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If 125g of KCIO3 are heated, what will be the total mass of the products?
2KCIO3 —> 2KCI + 3O2
Answer:
154.61 g.
Explanation:
he balanced chemical equation for the reaction of KCIO3 to form KCl and O2 is:
2KCIO3 -> 2KCl + 3O2
From this equation, we can see that for every 1 mole of KCIO3, 2 moles of KCl and 3 moles of O2 are produced.
First, we need to calculate the number of moles of KCIO3:
n = mass / molar mass
= 125g / (138.2 g/mol)
= 0.902 moles
Now that we have the number of moles of KCIO3, we can calculate the masses of the products:
Mass of KCl = 0.902 moles * (74.55 g/mol) = 67.53 g
Mass of O2 = 0.902 moles * (32.00 g/mol) * 3 = 87.08 g
So the total mass of the products will be:
67.53 g + 87.08 g = 154.61 g.
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enzymes are consumed in chemical reactions and cannot be used again. true/false
The given statement "enzymes are consumed in chemical reactions and cannot be used again" is false because the enzymes are not consumed during the chemical reaction.
The Enzymes are not the reactants and enzymes are not used up during the chemical reaction. Once the will enzyme binds to the substrate and enzymes will catalyzes the chemical reaction, the enzyme will released, and unchanged, and can be used for the another reaction. Enzymes are helpful in speed up the chemical reaction.
The enzyme is the biological catalyst and is is the protein. It is used to speeds up the rate of the specific chemical reaction in the cell.
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Review the terms and their defibituons in the mini glossary write a sentence describing what parts make up an atom
An atom is made up of a nucleus containing protons and neutrons surrounded by a cloud of electrons.
Protons and neutrons are collectively known as nucleons and together they make up the nucleus. Electrons orbit the nucleus at different energy levels.Defibrillation is a medical procedure that delivers a therapeutic dose of electrical energy to the heart muscle in order to restore a normal heart rhythm. This electrical energy is delivered by a device called a defibrillator. A glossary is a collection of terms and definitions, usually in alphabetical order, providing an explanation of a specific subject or topic.A glossary is an alphabetically organized list of words and definitions related to a specific topic. It provides an easy reference for understanding the language used in that subject.
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Examine the information.
A Magellanic penguin is at an initial position of 4 m and waddles to a position of 8 m in 8 s.
What is the penguin’s average velocity?
-4 m/s
4 m/s
0. 5 m/s
2 m/s
Penguin's average velocity is c)0.5m/sec if it is initial at 4m and switches to 8m position in 8 sec.So,correct option is c.
The word average essentially implies, the proportion of the amount of amounts to the absolute number of amounts. In Material science, an alternate methodology is taken. Presently prior to understanding normal speed, let us comprehend what speed precisely and speed is and the way in which these two are associated.
The speed of an item alludes to the adjustment of position of that article concerning time. Speed then again isn't anything, however the speed characterized concerning the course in which an item voyages.We will jump into insight regarding the contrast among speed and speed, until further notice, how about we return to the typical speed.
Presently average velocity as indicated by the definition is the proportion of the distance from point a to guide b of an article toward the time it takes to make that removal from point a to point b. It could be noticed that we utilize the term development rather than distance to stress the course.
Arithmetically and average velocity is characterized as, v = d /t,where d is the distance or displacement and t is the time taken for that removal.
Initially,penguin is at 4m position and in 8 sec it reaches to 8m position.So,distance covered by penguin in 8 sec=8m-4m=4m
So,average velocity=4m/8sec=0.5m/sec.
Hence,option c is correct.
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(Complete question) is:
Examine the information.A Magellanic penguin is at an initial position of 4 m and waddles to a position of 8 m in 8 s.
What is the penguin’s average velocity?
a)-4 m/s
b)4 m/s
c)0. 5 m/s
d)2 m/s
what do you think would happen if 1.6 ml of ethyl acetate were used as the reaction solvent as opposed to a mixture of 0.8 mll of ethyl acetate and 0.8 ml of hexane
If we use 1.6 ml of pure ethyl acetate instead of a mixture of 0.8 ml of ethyl acetate and 0.8 ml of hexane as the reaction solvent, means that the reaction would take place in a more polar solvent than otherwise.
Ethyl acetate is a more polar solvent than hexane. Since the experiment calls for a Craig tube, we know that crystallization is an important component of the experiment.
This process is highly sensitive to the polarity difference between the solute (reaction product) and solvent. Therefore, we would expect more difficulty completing the experiment's crystallisation step when pure ethyl acetate is used as the solvent.
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select all the statements that correctly describe organometallic reagents.
a. Organometallic reagents are good nucleophiles and strong base
b. Organometallic reagents are ionic since they contain bond between metal and nonmetal
c. Organometallic reagents are a source of electrophilic carbon
d. These reagents contain polar carbon-metal bond
what is the gas (pressure) that is being released during venting? why does the gas form and why is it less prominent as mixing is continued? 43a
Since many organic solvents are volatile, vapors will accumulate during mixing and raise the container's internal pressure. In order to release this pressure, it is necessary to frequently vent the mixing container.
As gas particles collide with the wall of their container, a force known as "gas pressure" is generated. Force is used to apply pressure to a region. Gas pressure is the force a gas applies to a certain location. As a result, the gas pressure of a gas is calculated by dividing the total surface area of the container walls by the sum of the forces the gas molecules exert on the walls of their container.
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How many formula units are in 5.50 grams of AgNO3
To compute the number of formula units in 5.50 grams of AgNO3, first calculate the molar mass of the compound, which is the sum of the atomic masses of silver (Ag), nitrogen (N), and oxygen.
(O). Molar mass of AgNO3 = (1 x Ag atomic mass) + (1 x N atomic mass) + (3 x O atomic mass) The molar mass of AgNO3 is equal to (1 x 107.87 g/mol) + (1 x 14.01 g/mol) + (3 x 16.00 g/mol). The molar mass of AgNO3 is 169.87 g/mol. Therefore, using the molar mass, we can convert the mass of AgNO3 to moles of AgNO3: moles AgNO3 = AgNO3 mass / AgNO3 molar mass moles AgNO3 = 5.50 g / 169.87 g/mol moles AgNO3 = 0.0324 mol Lastly, we may employ Avogadro's number, 6.022 x To convert moles of AgNO3 to formula units, multiply by 1023: formula units = moles AgNO3 x Avogadro's number formula units = 0.0324 mol x 6.022 x 1023 formula units/mol formula units = 1.95 x 1022 formula units/mol formula units = 1.95 x 1022 formula units As a result, 5.50 grams of AgNO3 contains roughly 1.95 x 1022 formula units.
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they also have different ____________ , or the amount of energy needed to increase the temperature of the object.
Oxygen and carbon, as well as other elements, have different specific heat capacities. Specific heat capacity, also known as specific heat, is the amount of energy required to increase the temperature of a substance by a certain amount.
The specific heat of a substance depends on its physical and chemical properties, such as its atomic structure, mass, and intermolecular forces. Different elements have different properties, which lead to differences in their specific heats.
For example, water has a high specific heat capacity compared to many other substances, which is why it is often used to regulate temperature in industrial processes and in nature. This means that it takes a relatively large amount of energy to increase the temperature of water by a given amount. In contrast, metals like copper have low specific heat capacities, which means that it takes much less energy to increase their temperature by the same amount.
In terms of the human body, the specific heat capacity of different tissues and organs is important for regulating body temperature. For example, the brain and the liver have high specific heat capacities, which helps to protect them from rapid temperature changes. In contrast, bone has a lower specific heat capacity, which makes it more susceptible to temperature changes.
Overall, the specific heat capacity of different elements and substances is an important physical property that has a significant impact on the behavior of matter. It is a fundamental property of materials that is essential for understanding and predicting the behavior of systems in the physical and natural sciences, including the human body.
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in which type of reaction does a more complex compound break down into two simpler substances?
A process whereby a compound is broken down into two or more simpler compounds. Reaction of displacement.
Decomposition reactions: the breaking down of a chemical molecule into less complex elements. These reactions work in opposition to synthesis reactions. Breaking down a highly complex chemical into two or more simpler substances is known as a decomposition reaction. The formula for this reaction is frequently written as AB A + B or C A + B. Everywhere, decomposition reactions take place. Reactions involving decomposition - A reaction in which a single component disintegrates, or decomposes, into two or more simpler substances. One illustration is the electrolysis of water, which occurs when an electric current is carried across it and produces hydrogen and oxygen gas.
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Of the following, which gives the correct order for atomic radius for mg, na, p, si and ar?
a. Mg > Na > P > Si > Ar
b. Ar > Si > P > Na > Mg
c. Na > Mg > Si > P > Ar
d. Si > P > Ar > Na > Mg
e. Ar > P > Si > Mg > Na
The correct order for atomic radius is:
d. Si > P > Ar > Na > Mg
The size of an atom increases as you go down a column in the periodic table, because each electron is added to a higher energy level farther away from the nucleus. The size of an atom decreases as you go across a row in the periodic table, because the effective nuclear charge increases, pulling the electrons closer to the nucleus.
To prevent time-temperature abuse when transporting food, which practice should be followed?
A. Stack all hot potentially hazardous (TCS) food items together in a sturdy cardboard box.
B. Load the delivery truck with potentially hazardous (TCS) cold items first and hot items last.
C. Transport cold potentially hazardous (TCS) food in an ice chest that maintains a temperature of 45 F.
D. Transport potentially hazardous (TCS) hot food in an insulated food container at 135 F or higher
To prevent the time temperature when transporting the food, the practice should be followed is the correct option is D. Transport potentially haza-r-dous ( TCS) hot food in an ins-ul-ated food container at the 135 or the higher.
The average body of the temperature is 98.6 that is 37 °C. The average body temperature, is will be as the high as 99 that is 37.2 °C or will be low as the 97 that is 36.1 °C. The temperature may be varies that is based on the time of the day .
Thus, Transport cold potentially haza-r-dous (TCS) that is hot food in the ins-ul-ated food container at the 135 or the higher.
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the density of pure iron is 7.874 g/cm3. what is the mass (in grams) of a piece of iron with a volume of 20.00 cm3? do not put units into your answer.
The density of pure iron is 7.874 g/cm³. The mass in grams of a piece of iron with a volume of 20.00 cm³ is 157.48 g.
The density of the pure iron = 7.874 g/cm³
The volume of the iron = 20.00 cm³
The expression for density is as :
Density = mass / volume
Mass = density × volume
Where
Density = 7.874 g/cm³
Volume = 20.00 cm³
Mass = 7.874 g/cm³ × 20.00 cm³
Mass = 157.48 g
Thus, the mass of the piece of the iron is 157.48 with the volume of the iron is 20.00 cm³ .
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Question 3 of 10
How would one make a 2 M solution of a compound?
A. By dissolving 2 moles of the compound in 1 L of water
B. By dissolving 1 molar mass of the compound in 2 L of water
C. By dissolving 1 mole of the compound in 2 L of water
D. By dissolving 2 g of the compound in 1 L of water
SEP Develop a Model Mountain climbers need really warm clothing because it
gets colder at higher altitudes. Sketch molecular models for equal-mass samples of
air at different altitudes. Use your models to show why there might be less energy
in the samples at higher altitudes.
Answer:
At lower altitudes, the air molecules are closer together and have more energy due to their increased interactions with each other. At higher altitudes, the air molecules are more spread out and have less energy due to their decreased interactions with each other. This can be represented by sketching molecular models of air at different altitudes.
At lower altitudes, the molecules are represented by a dense, tightly packed arrangement. At higher altitudes, the molecules are represented by a more spread out, less dense arrangement. This difference in density and energy can be seen in the models, and it explains why there is less energy in the samples at higher altitudes.
magnesium chloride is often used to melt ice on sidewalks. considering that the solubility of magnesium chloride (95.21 g/mol) in water is 54.3 g per 100.0 g of water, what is the lowest temperature that you would expect to be able to melt ice with magnesium chloride? assume ideal behavior. kf(water)
The lowest temperature at which magnesium chloride is anticipated to be able to melt ice is -46.5°C.
Molality is defined as the concentration of solute particles per kilogram of solvent expressed in moles.
To calculate the freezing point depression:
[tex]\rm \Delta T_f = i\times K_f\times molality[/tex]
where, ΔTf is the change in freezing point.
[tex]\rm K_f[/tex] is the freezing point depression constant.
molality = (mass/molar mass)[tex]\times[/tex] (1000/mass of solvent in gm)
molar mass of [tex]\rm MgCl_2[/tex] = 95.2 g/mol
i = Van't Hoff factor, for [tex]\rm MgCl_2[/tex] Van't Hoff factor is 3.
Now, plugging the values, we get:
[tex]\rm \Delta T_f[/tex] = 3 [tex]\times[/tex] 1.86 [tex]\times[/tex] (54.3/95.21) [tex]\times[/tex] (1000/100)
[tex]\rm \Delta T_f[/tex] = 31.82 °C
To get the lowest temperature at which magnesium chloride can melt ice, subtract it from the freezing point of water (0°C):
[tex]\rm \Delta T_f[/tex] = [tex]\rm T_0-T_1[/tex] ([tex]\rm T_0[/tex]= freezing point of solvent, [tex]\rm T_1[/tex]= freezing point of solution)
31.82 = 0.0 - [tex]\rm T_1[/tex]
[tex]\rm T_1[/tex]= -31.82 °C
Therefore, lowest temperature to melt the ice is -31.82 °C.
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