Answers
The equation of the reaction is written as; [tex]4Al(s) + 3O_{2} (g) ---- > 2Al_{2} O_{3} (s)[/tex]
What is a reaction?It is common to see that in science, we have the combination of two substances and as the substances are combined there is a cleavage of the bonds that holds the molecules of the substances together and then new bonds are formed as the molecules are recombined in the products.
In this case we want to see the reaction between oxygen and aluminum. Now the word equation is aluminum + oxygen -----> aluminum oxide. The reaction equation would show the actual atoms that combined.
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Related Questions
the atomic mass of sulfur is 32.06u. how many atoms are present in exactly 2 mol of sulfur
Answers
The number of atoms in 2 moles of the sulfur is 1.204 * 10^24 atoms
How many moles are present?We know that atoms are contained in an element. The number of atoms that are contained in one mole of a substance is given by the Avogadro's number.
Now we know that one mole of sulfur is going to contain 32.06 g of sulfur. This is because this is the mass of one mole of the sulfur atoms that are present. 2 moles of sulfur would contain 64.12 g
Given this fact we can now say that;
32.06 g of sulfur contains 6.02 * 10^23 atoms'
64.12 g of sulfur will contain 64.12 g * 6.02 * 10^23/ 32.06 g
= 1.204 * 10^24 atoms
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a. 25.0ml of a solution of sodium hydroxide solution required 21.50ml of 0.100 mol sulphuric acid for neutralisation.
Find the concentration of the sodium hydroxide solution in mol/.
H₂SO₄aq+2 NaOH{aq}-----> Na₂SO₄{aq}+2 H₂O{l}
b. Find the volume of 1.2 mol/I hydrochloric acid that reacts with 25.00 cm³ of 1.50 mol /dm³ sodium hydroxide.
HCl{aq}+NaOH{aq} ------>NaCl{aq}+H₂O{l})
c. What volume of 0.040 mol/I calcium hydroxide just neutralises 25.0 ml of 0.100 mol/I nitric acid?
Ca(OH)₂(aq)+2 HNO₃{aq}------> Ca(NO3)₂{aq}+2 H₂O{l}
Answers
A. The concentration of the sodium hydroxide solution is 0.172 mol/L
B. The volume of hydrochloric acid that reacts is 31.25 cm³
C. The volume of calcium hydroxide solution is 31.25 mL
A. How do I determine the concentration of sodium hydroxide?
The concentration of sodium hydroxide solution can be obtained by doing the following:
H₂SO₄ + 2NaOH -> Na₂SO₄ + 2H₂O
From the balanced equation above, the following were obtained:
The mole ratio of the acid, H₂SO₄ (nA) = 1The mole ratio of the base, NaOH (nB) = 2From the question, we obtained:
Volume of base, NaOH (Vb) = 25 mLVolume of acid, H₂SO₄ (Va) = 21.5 mL Concentration of acid, H₂SO₄ (Ca) = 0.1 mol/L Concentration of base, NaOH (Cb) =?CaVa / CbVb = nA / nB
(0.1 × 21.5) / (Cb × 25) = 1/2
2.15 / (Cb × 25) = 1/2
Cross multiply
Cb × 25 = 2.15 × 2
Cb × 25 = 4.3
Divide both side by 25
Cb = 4.3 / 25
Cb = 0.172 mol/L
Thus, the concentration of the sodium hydroxide, NaOH solution is 0.172 mol/L
B. How do I determine the volume of the hydrochloric acid?
The volume of the hydrochloric acid can be obtained as follow:
HCl + NaOH -> NaCl + H₂O
From the balanced equation above, the following were obtained:
The mole ratio of the acid, H₂SO₄ (nA) = 1The mole ratio of the base, NaOH (nB) = 1From the question given, we obtained the following:
Concentration of acid, HCl (Ca) = 1.2 mol/LVolume of base, NaOH (Vb) = 25.00 cm³Concentration of base, NaOH (Cb) = 1.50 mol /dm³ = 1.50 mol /LVolume of acid, HCl (Va) =?CaVa / CbVb = nA / nB
(1.2 × Va) / (1.5 × 25) = 1
(1.2 × Va) / 37.5 = 1
Cross multiply
1.2 × Va = 37.5
Divide both side by 1.2
Va = 37.5 / 1.2
Va = 31.25 cm³
Thus, the volume of the hydrochloric acid is 31.25 cm³
C. How do I determine the volume of the calcium hydroxide?
The volume of the calcium hydroxide solution can be obtained as follow:
Ca(OH)₂ + 2HNO₃ -> Ca(NO3)₂ + 2H₂O
The mole of the acid, HNO₃ (nA) = 2The mole of the base, Ca(OH)₂ (nB) = 1Concentration of base, Ca(OH)₂ (Cb) = 0.04 mol/LVolume of acid, HNO₃ (Va) = 25 mL Concentration of acid, HNO₃ (Ca) = 0.1 mol/LVolume of base, Ca(OH)₂ (Vb) =?CaVa / CbVb = nA / nB
(0.1 × 25) / (0.04 × Vb) = 2
2.5 / (0.04 × Vb) = 2
Cross multiply
2 × 0.04 × Vb = 2.5
0.08 × Vb = 2.5
Divide both side by 0.08
Vb = 2.5 / 0.08
Vb = 31.25 mL
Thus, the volume of the calcium hydroxide, Ca(OH)₂ is 31.25 mL
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A gas at 5.00 atm pressure was stored in a tank during the winter at 5.0 °C. During the summer, the temperature in the storage area reached 30.9 °C. What was the pressure in the gas tank then?
Answers
A gas at 5.00 atm pressure was stored in a tank during the winter at 5.0 °C. During the summer, the temperature in the storage area reached 30.9 °C. the pressure in the gas tank then was 5.43 atm
According to gay lussac law :
P1 / T1 = P2 / T2
P1 = 5 atm
P2 = ?
T1 = 273 + 5 = 278 K
T2 = 273 + 30.9 = 303.9 K
now, P1 / T1 = P2 / T2
5 / 278 = P2 / 303.9
P2 = 5.43 atm
Thus, A gas at 5.00 atm pressure was stored in a tank during the winter at 5.0 °C. During the summer, the temperature in the storage area reached 30.9 °C. the pressure in the gas tank then was 5.43 atm
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how many molecules in 12 grams of h20
Answers
There are 5.02 *10²² molecules in 12 grams of water.
What is a molecule?
This refers to two or more atoms joined by chemical bonds. egH₂0.
What is molecular weight?
This refers to the total weights of the individual atoms that comprise the molecule.
How to calculate number of molecules in a chemical compound.
.Calculate the molecular weight of the substance for one mole.
. Divide the molar mass value by the molecular mass.
. Finally, multiply by the Avogadro constant.
Recall,
1 mole of a subtance= 6.022×10²³ atoms(Avogadro's Law)
Hence calculating the number of molecules in 12g of H₂0 we have:
1 mole of H₂0=(1*2) +(8*2)
18g
18g of H₂0 contains 6.022×10²³ atoms
Then 12g of H₂0 contains:
number of molecules=Number of atoms /mass of H₂0
=6.022×10²³/12
=5.02×10²²
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2.5.2 Test (CST): Computer-Scored Unit Test
Question 3 of 25
Which characteristic gives the most information about what kind of element
an atom is?
OA. The number of electrons
B. The number of neutrons
C. The atomic number
OD. The atomic mass
k
Answers
The number of positive charge units (protons) in the nucleus is defined as the atomic number, which is the single most significant property of an atom. Atomic numbers are typically represented by the symbol Z.
What are an atom and atomic number?A component of an element is an atom. A specific element only has one kind of atom per atom. Protons, neutrons, and electrons, which are subatomic particles, make up the remainder of an atom. Chemical reactions can result in the combination of elements to create molecules. The number assigned to a chemical element by its atomic number in the periodic system places the elements in ascending order of the number of protons in their nuclei.
The number of positive charge units (protons) in the nucleus is defined as the atomic number, which is the single most significant property of an atom. Atomic numbers are typically represented by the symbol Z.
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How many shells are there in the Bohr model of a hydrogen atom?
Answers
Answer:
Explanation:
When looking at the periodic table, the period (row) corresponds to the number of shells or PEL (principled energy level).
Hydrogen is in the first period and thus has one shell.
if u have 100 ml of water in a foam cup or 100 ml of water in a can which variable gets manipulated
Answers
The variable that gets manipulated is Aluminium.
Hot water has more energy than cold water so the sugar dissolves faster in hot water than in cold water. When water is heated, the molecules gain energy and move faster. Because they move faster, they come into contact with the sugar more often dissolving it faster. I can do it. Changing the amount of water will affect the plant growth rate values.
Therefore, we know that the amount of water is the independent variable and the plant growth rate is the dependent variable. The energy from the hydrothermal molecules makes the solid more soluble. In hot water, molecules move more so there are more collisions between water molecules and solids.
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What is the absorbance of a solution that absorbs 45.0% of
incident 500nm VIS radiation?
Answers
The absorbance of a solution that absorbs 45.0% of incident 500nm is equal to 0.26.
What is absorbance?Absorbance can be defined as the logarithm of the ratio of incident light to transmitted light through a sample. Absorbance may also be defined as the negative logarithm of one minus transmittance, as measured on a uniform sample.
If I₀ is the intensity of the incident light and 'I' is the intensity of the light detected after traveling a distance 'd', the fraction transmitted T, is given by:
[tex]A = log\frac{I_o}{I}[/tex]
Given, the light absorbed by the solution = 45%
The radiation incident on the solution, I₀ = 100 %
The radiation transmitted by the solution = 100 - 45 = 55%
The absorbance of the solution is given by: A = log (I₀/I)
A = log (100/55)
A = 0.26
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An equilibrium constant of acid-base chemistry that is greater than 1 is recovered from.
Answers
A high K value (higher than 1) denotes an equilibrium with more products than reactants, whereas a low K value (less than 1) denotes an equilibrium with more reactants than products.
The equilibrium constant's value reveals whether a reaction is beneficial or unfavorable. Favorable reactions have a Keq value greater than 1, which indicates that energy is liberated throughout the reaction and that the reactants have a higher energy than the products. A spontaneous cell response changes free energy in the negative. The equilibrium constant for these reactions is significantly greater than 1. For these reactions, the value of the standard cell potential is positive.
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The following is a DNA nucleotide sequence. Write the sequence of nucleotides that would pair up with this sequence: GCA TCT CCC CGA
Answers
Answer: CGT AGA GGG GCT
Explanation:
Cytosine adds up with the G (forgot the name of it) and A connects with the G.
When 0.1 mol of PCls (g) is heated at 78.5 °C in a 1.00 L container, the pressure at
equilibrium is 3.50 x 105 Nm2. Calculate the degree of dissociation of PCIs.
Answers
Based on the pressure of the gas in the 1.00 L container, the percentage dissociation of PCl₅ is 60%.
What is the equation of the dissociation of PCl₅?The equation of the dissociation of PCl₅ when heated is given below:
PCl₅ (s) ---> PCl₃ (g) + Cl₂ (g)
Based on the equation of the dissociation of PCl₅, 1 mole of PCl₅ decomposes to give 1 mole of PCl₃ gas and 1 mole of Cl₂ gas.
Hence, 1 mole of PCl₅ dissociates to give 2 moles of gas.
0.1 mole of PCl₅ will dissociate to give 0.1 * 2 moles of gas = 0.2 moles of gas.
At STP, the pressure of 0.2 moles of gas is calculated as follows:
PV = nRT
where;
P is pressure = ?V is volume = 1.00 Ln is the number of moles = 0.2R is molar gas constant = 0.082 L.atm/k.molT is temperature = (273 + 78.5) KP = nRT / V
P = 0.2 * 0.082 * 351.5/ 1
P = 5.76 atm or 5.84 * 10⁵ N/m²
Percentage dissociation of PCl₅ = (3.50 * 10⁵/5.84 * 10⁵) * 100%
Percentage dissociation of PCl₅ = 60%
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Silver ion can be used to gravimetrically analyze Br- ion. Calculate the gravimetric factor for Br- using silver bromide. Please show how to do so as well.
Answers
The gravimetric factor for Br- using silver bromide is 0.425.
What is the gravimetric factor?The gravimetric factor is an expression that is used to convert grams of a compound into grams of a single element.
It is expressed as a ratio of the formula weight (FW) of the substance that is being determined to that of a second substance that is weighed.
Gravimetric factor = formula mass of substance weight / formula mass of substance soughtFor example formula of silver bromide is AgBr and the formula mass of silver bromide is 188 g/mol
Formula mass of bromide ion = 80 g/mol
Gravimetric factor = 80/1188
Gravimetric factor = 0.425
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What is the freezing point (in degrees Celcius) of 3.27 kg of water if it contains 193.9 g of CaBr₂? The freezing point
depression constant for water is 1.86 °C/m and the molar mass of CaBr₂ is 199.89 g/mol.
Answers
The solution's freezing point is 1.65°C.
What is freezing point?The freezing point depression formula is: Adding a solute to the original solvent causes the freezing point to decrease.
ΔT = kf×m×i
Where m is the molality of the solution (Moles CaBr2 -solute- / kg water -solvent), Kf is the freezing point depression constant of the solvent (1.86°C/m), and I is the Van't Hoff factor.
Molality of the solution is:
moles CaBr₂ = 193.9g ₓ (1mol / 199.89g) = 0.97 moles
Molality is:
0.97 moles CaBr₂ / 3.27kg water = 0.296m
For CaBr2, the van't hoff factor indicates how many moles of solute are generated following the dissolution of one mole of solid solute:
CaBr₂(s) → Ca²⁺ + 2Br⁻
1 mole of solid solute yields 3 moles of ions, and the Van't Hoff factor is 3.
ΔT = kf×m×i
ΔT = 1.86°C/m×0.296m×3
ΔT = 1.651
Water loses 1.65°C of its freezing point. Water's 0°C freezing point means that
The solution's freezing point is 1.65°C.
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how is polarity designated in a molecule
Answers
Due to comparable differences in electronegativity of different elements, partial positive and negative charges developed, hence polarity designated in a molecule.
The terms "polar" and "nonpolar" normally seek advice from covalent bonds. To determine the polarity of a covalent bond the usage of a numerical manner, find the distinction among the electronegativity of the atoms; if the end result is between 0.4 and 1.7, then, generally, the bond is polar covalent.
When the atoms linked by way of a covalent bond are distinct, the bonding electrons are shared, however now not similar. rather, the bonding electrons are extra attracted to at least one atom than the alternative, giving upward thrust to a shift of electron density closer to that atom.
This unequal distribution of electrons is referred to as a polar covalent bond, characterized by means of a partial nice fee on one atom and a partial negative price on the other. The atom that attracts the electrons extra strongly acquires the partial poor fee and vice versa.
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When a piece of sodium metal is dropped into a calorimeter filled with water, hydrogen gas evolves. The temperature of the mixture rises because.
Answers
The evolution of hydrogen gas occurs when a piece of sodium metal is dropped into a calorimeter containing water because sodium loses electrons and is oxidized, whereas water is reduced.
Hydrogen gas is created when sodium metal reacts with water, and sodium hydroxide is also created. In this way, one electron is removed from the metal (Na), and an electron is added, turning water into hydrogen gas.
A calorimeter is a device that is used in calorimetry, which is the process of calculating the heat produced by chemical reactions, physical changes, and heat capacity. Among the most popular kinds are titration calorimeters, isothermal micro calorimeters, accelerated rate calorimeters, and differential scanning calorimeters.
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25.0 L of an ideal gas at 278 K and 4.11 atm are heated to 393 K with
a new pressure of.7.00 atm. What is the new volume (in L)?
Answers
The new volume (in L) is 12.2 L
What is Boyle's law Formula and Derivation?According to Boyle's law, a gas's pressure will change whenever its volume changes, even when its quantity and temperature remain constant.Information given:
Volume 1 = 15.0 L
Temperature 1 = 298 K ---------> Temperature 2 = 383 K
Pressure 1 = 3.36 Atm -----------> Pressure 2 = 5.308 Atm
Information they're asking: New Volume 2?
When it comes to ideal gas queries, there are numerous formulae. The combined gas law, which essentially combines all of the gas laws into a single equation, comes to mind as one example. It goes like this: P1V1 / T1 equals P2V2 / T2.We've decided to look for Volume #2, or the volume change that occurs when the temperature rises (as well as the noticeable change in pressure). In order to leave V2 alone on the right side of the equation, the subsequent step is algebraic. When we finish, the equation becomes: P1V1T2 / T1P2 = V2.Substituting it with numbers (Yay! we were provided Kelvins, that's always a plus), we get;
3.36 Atm * 15.0 L * 383 K = V2 = 12.2 L
298 K * 5.308 Atm
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Which of the following pairs of liquids are likely to be miscible? Check all that apply. Which of the following pairs of liquids are likely to be miscible?Check all that apply. C8H18 and C6H6 Na3PO4 , and H2O H2SO4 and H2O CS2 and CCl4
Answers
For miscible : Poler will be miscible in polar.
Non polar will miscible in non polar .
1) C8H18 and C6H6 ( Both are non polar , miscible)
2) H2SO4 and H2O ( Ionic and polar , miscible )
3) CS2 and CCl4 ( Both are non -polar , miscible )
4) Na3PO4 , and H2O ( Salt ionic and polar , miscible )
A liquid is a almost incompressible fluid that conforms to the form of its field however keeps a regular extent impartial of strain. As such, it's miles one of the 4 essential states of remember, and is the only country with a specific quantity but no constant shape.
The atoms in a liquid are loose to transport around, although they can't pass closer collectively or farther apart. This means a liquid flows and modifications shape to fill the space around it.
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1. Up to this time , scientists had identified elements by determining the properties of elemental substances . Because the properties of elements differ from the properties of compounds that contain those elements , scientists had used a variety of methods , including the battery , to decompose compounds into elemental substances . How did the spectroscope change the way scientists looked for elements ?
Answers
The spectroscope has changed the way scientists looked for elements in that it allows for the identification of elements from compounds without a need to decompose the compounds.
What is a spectroscope?A spectroscope also known as a spectrometer is an instrument that produces and analyzes the spectra or absorption lines using visible light.
The spectrometer measures and interprets the electromagnetic spectra that result from the interaction between electromagnetic radiation and matter.
These measurements are obtained or determined from the wavelength or frequency of the radiation.
A spectroscope is used to analyze and study the elemental components of compounds without having to decompose the compounds into elemental substances.
Thus, spectroscopes have proved to be useful in the study of the properties of elements in compounds.
Compounds are formed when two or more elements are combined together.
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if the dissolution of borax in water is spontaneous, is the change in enthalpy positive or negative - or are both signs possible?
Answers
Specific heat capacity of a substance is the amount of heat required to raise the temperature by one degree Celsius of one gram of a substance. Therefore, the change in enthalpy will be negative.
What is Enthalpy?Enthalpy term is basically used in thermodynamics to show the overall energy that a matter have. Mathematically, Enthalpy is directly proportional to specific heat capacity of a substances.
Mathematically,
Enthalpy=mass of solution× specific heat capacity of solution ×Change in temperature.
Any reaction which is spontaneous, then the enthalpy related to this type of reaction is always negative that is reaction is always exothermic.
Therefore, the change in enthalpy will be negative.
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Which statement is true about synthesis reactions?
O They must have one or more reactants.
O They must have more than one product.
They must have two or more reactants
They must have two or more products.
Answers
A synthesis reaction has to do with one that they must have two or more reactants.
What is a synthesis reaction?In a synthesis reaction we would have the combination of two or more reactants but we are going to have a single product. The reactants that we have would somehow just combine and give us the product that we are looking for.
Thus, the idea of the synthesis reaction is that there would be a joining of the reactants. This already means that we must have more than one of the reactants so that we can have the species that would be joined in the reaction.
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How many joules of energy will be saved by using LED bulb rated at 7.4 watts instead
of a 60 watts incandescent bulb over a 6.5 hour period?
Hint: find the energy use for each of them, then find the difference)
1 kilowatt-hour (kWh) = 3.6 x 106 joules (J)
Answers
The energy saved by using an LED bulb is equal to 1.23 ×10⁶ J.
What is power?Power can be described as the amount of energy transferred or converted per unit of time. The S.I. unit of power is one joule per second (J/s) or Watt (W).
Power can be described as a time-based quantity and the rate at which work should be done upon an object. The formula for power can be represented as mentioned below.
Power = Work/time
P = W/t
Given, the power of the first bulb, P = 7.4 W
The bulb gives energy for a time, t = 6.5 hours
Work or energy of the first bulb = 7.4 × 6.5 = 48.1 W.h
Given the power of the second bulb, P = 60 W
The bulb gives energy for a time, t = 6.5 hours
Work or energy of the second bulb = 60 × 6.5 0 = 390 W.h
The difference in the energy = 390 - 48.1 = 341.9 Wh
The energy difference in (Joules) = 341.9 × 3600 = 1.23 ×10⁶ J
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Please and thank you
Answers
Answer:
A
Explanation:
What is the frequency of an orange light with a wavelength of 483nm
Answers
Answer: frequency= speed of light * wavelength
1.44799757×10*11
Explanation:
HELP ASAP URGENT WILL GIVE BRAINIEST (CORRECT ANSWERS ONLY!!!!!) What mass of H2 forms when 32.25g Al reacts with excess hydrochloric acid? 2AI +6HCI > 2AIC3+3H2
AI: 26.98 g/mol
H2: 2.02 g/mol
[?]g H2
Answers
Answer: The correct answer (based on the ratio provided) is the mass of H₂ produced equals 3.51 g of H₂
Explanation:
The equation of the reaction:
2AI + 6HCI → 2AICI₃ + 3H₂
Based on the equation 2 * 27g of Al will produce 3 * 2g of H₂
As a result, 32.25g of Al will produce: 6/55 * 32.25g of H₂
The mass of H₂ produced is therefore 3.51g of H₂
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L
Apply Concepts
6. Look at the illustration. What causes
the phase change of water shown in
the illustration? How do you know?
Chapter 1,1anson 3 Check What are solids, liquids, and gases?
Answers
The phase change of water is water particle to evaporate forming water vapor
When water changes state in the water cycle and the total number of water particles remain the same and the changes of state include melting, sublimation, evaporation, freezing, condensation and deposition and heating the water in the first beaker causes the water particles to evaporate and forming water vapor and the particle are far apart and on a molecular level the intermolecular forces between the water molecule are decreasing and the heat is providing enough for the water molecule to overcome these attractive forces and all changes involve either an increase or decrease of intermolecular forces
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What is the mass of 4.23 × 10^24 molecules of oxygen?
Answers
Taking into account the definition of Avogadro's Number and molar mass, the mass of 4.23×10²⁴ molecules of oxygen is 112.37 grams.
Definition of Avogadro's Number
Avogadro's Number is called the number of particles that make up a substance (usually atoms or molecules). This can be found in the amount of one mole of said substance and its value is 6.023×10²³ particles per mole.
Avogadro's number applies to any substance.
Definition of molar massThe molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.
Mass of 4.23×10²⁴ molecules of oxygenYou can apply the following rule of three: if 6.023×10²³ molecules are contained in 1 mole of oxygen, then 4.23×10²⁴ molecules are contained in how many moles of oxygen?
amount of moles of oxygen= (4.23×10²⁴ molecules × 1 mole)÷ 6.023×10²³ atoms
amount of moles of oxygen= 7.023 moles
7.023 moles of oxygen are 4.23×10²⁴ molecules of oxygen.
Being 16 g/mole the molar mass of oxygen, the mass of oxygen in 7.023 moles is calculated as:
mass of oxygen= 7.023 moles×16 g/mole
mass of oxygen= 112.37 grams
Finally, a mass of 112.37 grams are present in 4.23×10²⁴ molecules of oxygen.
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Use Hess’s Law to calculate the enthalpy change for the reaction.
C2H4(g) + H2(g) → C2H6(g) ∆Hrxn = ?
Given:
C2H4(g) + 3O2(g) → 2CO2(g) + 2H2O(l) ∆Hrxn 1 = -1410.9kJ
2C2H6(g) + 7O2(g) → 4CO2(g) + 6H2O(l) ∆Hrxn 2 = -3119.4kJ
2H2(g) + O2(g) → 2H2O(l) ∆Hrxn 3 = -571.6kJ
Answers
Answer:
∆Hrxn 1 + ∆Hrxn 3 - ∆Hrxn 2 = ?
-1410.9kJ - 571.6kJ + 3119.4kJ = ?
-2801.1kJ
This organelle functions in cellular respiration and makes energy
O mitochondria
O lysosome
O endoplasmic reticulum
O Golgi apparatus
Answers
Answer:
mitochondria
Explanation:
mitochondria is an organelles that is used in cellular respiration and makesbenetgy
When 0.1 mol of PCls (g) is heated at 78.5 °C in a 1.00 L container, the pressure at
equilibrium is 3.50 x 105 Nm2. Calculate the degree of dissociation of PCIs.
Answers
When 0.1 mol of PCls (g) is heated at 78.5°C in a 1.00 L container, the pressure at equilibrium is 3.50 x 10⁵ Nm² so the degree of dissociation of PCIs is 60%
Dissociation is the breaking up of a compound into simpler constituents that are usually capable of recombining under other conditions.
Here given data is
Temprature = 78.5 °C
Pressure = 3.50 x 10⁵ Nm²
We have to calculate the degree of dissociation of PCI₅ = ?
Then the equation of dissociation of PCl₅ when heated is given below
PCl₅ → PCl₃ + Cl₂
Based on the equation of the dissociation of PCl₅ the 1 mole of PCl₅ decompose to give 1 mole of PCl₃ gas and 1 mole of Cl₂ gas
Hence 1 mole of PCl₅ dissociates to give 2 mole of gas
So 0.1 mole of PCl₅ will dissociate to give 0.1×2moles of gas = 0.2 moles of gas
At STP the pressure of 0.2 mole of gas is calculated as follow
PV = nRT
Where P = pressure = ?
V = 1.00 L
n = number of moles = 0.2
R = molar gas constant = 0.082 L atm/kmol
T = temprature = (273 + 78.5)K
P = nRT
P = 0.2×0.082×351.5/1
P = 5.76 atm or 5.84×10⁵N/m²
Percentage dissociation of PCl₅ = (3.50×10⁵/5.84×10⁵)×100%
Percentage dissociation of PCl₅ = 60%
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Scientists have changed the model of the atom as they have gathered new evidence. One of the atomic models is shown below.
A large black cross in a purple circle with a black line around the purple, with 10 small green balls dispersed within the purple circle.
What experimental evidence led to the development of this atomic model
Answers
The experimental evidence that led to the development of this atomic model is that atom is divisible and having subatomic particles such as proton, electron and neutron.
What are experimental evidence?Experimental evidence is said to be comprised of observations generated under controlled conditions rather than through other empirical research methods. The experimental evidence makes it possible for scientist to draw causal inferences about a phenomenon under study.
From the gold foil experiment, some of the positive particles aimed at a gold foil seemed to bounce back which gives information to the scientists that some heavy particles present in the center of the atom which bounce back the positive particles.
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