How is the molar mass of a compound similar to its formula mass?


How is the molar mass of a compound different from its formula mass?

Item analysis involves analyzing the performance of test items by calculating statistics such as item difficulty, item discriminability, and item discrimination. This information can be used to improve the test items, identify flawed items, and evaluate the overall quality of the test.

a. item discriminability - This refers to the ability of an item on a test to discriminate between students who have high levels of knowledge or skill in the domain being tested and those who do not.

b. mental age - This is a measure of intellectual ability that compares a person's performance on an intelligence test with the performance of typical individuals at different ages.

c. item discrimination - This is another term for item discriminability, which refers to the ability of an item on a test to discriminate between high- and low-performing students.

d. item difficulty - This refers to the level of challenge posed by an item on a test, typically measured as the proportion of students who answer the item correctly.

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--The complete question is, Dr. Marcus analyzed items on his physics test by calculating the proportion of students who got each item correct. Dr. Marcus was examining,

a. item discriminability

b. mental age

c. item discrimination

d. item difficulty--

Yes, all of these energy output objects can work with a turbine. Turbines are designed to convert energy from a source, such as the wind or flowing water, into useful forms of energy, such as electricity or movement.

Energy is an important concept in physics that describes the capacity of a physical system to do work. It is often described as the ability to do work and can be found in many forms, including kinetic energy, potential energy, thermal energy, electrical energy, and chemical energy. Kinetic energy is the energy of motion and is the result of an object's movement. Potential energy is the stored energy of an object due to its position or configuration. Thermal energy is energy contained in the movement of particles and is related to temperature.

This energy can then be used to power a variety of energy output objects, such as water heaters, light bulbs, and fans.

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In this question, the density of cobalt is equal to 8.86 g per cubic centimeter. The mass of average atom of cobalt is equal to 9.786 316 times 10. Raise to part minus 23 grand. So this is the mass of average item of cobalt. And we have to calculate the number of atoms of cobalt, when volume  is equal to one cc. So in one cc of cobalt we have to calculate the number of atoms of COBOL present. First of all, using the formula that density is equal to mass divided by volume. We can calculate the mass of atoms present in one cc. So the mass would be equal to density, multiplied by volume. From this mass comes out to be density is 8.86 g per centimeter cube and volume is one centimeter tube. So the mass would be equal to 8.86 g. Now we have the mass of atoms present in one cc of COBOL. Now, since mass is 8.86 g and we know that 9.7863 16 times 10 raise to part -23 g is equal and to one atom since it is a mass of average atom of cobalt. So from this we can say that 8.86 g of cobalt would be equal to one divided by 9.7686316 multiply by 8.86 atoms of Cobalt. From this. By solving it, we will get the value which is equal to when we multiply and divide these things. We will get the value 9.5 times 10, raise to part 22 atoms, so 9.5 Multiply by 10 days to part 22 items are present in 8.86 g of cobalt. Or we can say that one cc of cobalt. So our answer is option A.

I hope this helps!  o(〃＾▽＾〃)o

The type of reaction shown is a double displacement reaction.

The given chemical equation represents a chemical reaction known as a double displacement or metathesis reaction.

In this type of reaction, the cations and anions of two different compounds switch places, resulting in the formation of two new compounds.

In the given equation, Compound A and Compound B react to form Compound C and Compound D by exchanging their respective cations and anions.

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The volume of 2.63×10-² M barium hydroxide required to neutralize 16.1 mL of a 0.110 M nitric acid solution is 67.34mL.

The volume of a substance can be calculated using the following expression:

CaVa = CbVb

Where;

According to this question, 2.63×10-² M barium hydroxide is required to neutralize 16.1 mL of a 0.110 M nitric acid solution.

0.0263 × Va = 16.1 × 0.110

0.0263Va = 1.771

Va = 67.34mL

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Answer:

D: X: Be3+, Y: 91.6nm.

Explanation:

The energy required to photoionize an ion from its excited state depends on the electron configuration and energy levels of the ion. Option D corresponds to the ionization energy for Be3+ from its 3rd excited state, which is known to be 91.6 nm. Options A and C correspond to incorrect ionization energies for Li2+ and cannot be the correct answer.

ALLEN

Answer:

A) 21 - 6 carbon, 7 oxygen, and 8 hydrogen

B) 12 - 6 hydrogen, 3 carbon, and 3 oxygen

Explanation:

Also, here is #39 :)

A) 56 - 36 Hydrogen, 18 Carbon, and 2 Oxygen

B) 167 - 104 Hydrogen, 57 Carbon, and 6 Oxygen

The R or S designation is assigned to each stereogenic center based on the priority of the substituents attached to that carbon atom.

Enantiomers are pairs of molecules that are non-superimposable mirror images of each other. Enantiomers have the same chemical and physical properties, except for their interaction with polarized light. Enantiomers have opposite configurations at every stereogenic center, so they have opposite R or S designations.

Diastereomers, on the other hand, are stereoisomers that are not mirror images of each other. Diastereomers have different physical and chemical properties, and they have different configurations at one or more stereogenic centers. Unlike enantiomers, diastereomers do not have opposite R or S designations.

To identify stereogenic centers in a molecule, one needs to determine the number of different substituents attached to a carbon atom. The R or S designation is assigned to each stereogenic center based on the priority of the substituents attached to that carbon atom.

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Answer: c – Reactant 1

Explanation:

Since HNO3, (Nitric Acid), is an acid, that leaves Mg(OH)2 to be the Base in the reaction.

Hence the answer is Reactant 1

Answer:

it's c

Explanation:

maybe...I don't know how I works it out but it is c

0.4 amount of br2 (in moles) was formed during the first 15. 0 s of the reaction.

A chemical reaction is a process that causes a chemical transformation of one set of chemicals into another. Classically, chemical reactions involve changes involving only the position of electrons in the formation and breaking of chemical bonds between atoms, and changes in the nucleus (no change in the elements present) can often be described by chemical equations. Nuclear chemistry is a subset of chemistry that involves the chemical reactions of unstable radioactive elements in which both electronic and nuclear changes can occur.

Now,

Correct option is (C)

            N2 +O2 ⇌2NO

At t = 0            2          4         0

At eq.            2-x    4-x       2x

Half a mole of nitrogen is used up at equilibrium,

x = 0.5

So, moles of NO=1.

Molar concept of NO at equilibrium = 1/ 2.5

​                                                            = 0.4.

Complete Question:

The equilibrium N₂(g)+O₂(g)⇌2NO(g) established in a reaction vessel of 2.5 L capacity. The amounts of N₂ and O₂ taken at the start were respectively 2 moles and 4 moles. Half a mole of nitrogen has been used up at equilibrium. The molar concentration of nitric oxide is :

(1) 0.2          (2) 0.8           (3) 0.6           (4) 0.1

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The mass of the solid sample in grams would be 2.87 grams.

Mass of the weighing boat = 2.193 grams

Mass of the weighing boat and the sample = 5.063

In other to determine the mass of the solid sample, the mass of the weighing boat needs to be subtracted from the mass of the weighing boat and the sample.

Mass of sample = Mass of sample+weighing boat - mass of weighing boat.

                          = 5.063 - 2.193

                          = 2.87 grams

In other words, the mass of the solid sample is 2.87 grams.

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Answer:

During high-intensity interval training, a pH decrease may affect how well glycogen is used. Acidosis, often known as a drop in pH, is a condition that develops when lactic acid builds up in the muscles. The glycogen phosphorylase enzyme, which converts glycogen to glucose, may become inhibited as a result of this acidosis. As a result, glycogen is used less frequently as a source of energy. As a result of this decline in glycogen usage, tiredness and poor performance during intense activity may result. However, the impact of acidosis on glycogen use is poorly understood, and more investigation is needed to identify the underlying mechanism.

Explanation:

Answer:

During high-intensity interval exercise, a drop in pH can affect glycogen utilization in several ways. A decrease in pH, also known as acidosis, can lead to a decrease in the activity of enzymes involved in glycogen metabolism. For example, glycolytic enzymes, which break down glycogen into glucose and other metabolites, are sensitive to changes in pH and their activity may be decreased in acidic conditions.

In addition, acidosis can also reduce the availability of glycogen in muscle cells, as it can cause the breakdown of glycogen into lactate, which can interfere with the normal functioning of the muscle. This, in turn, can lead to decreased energy production and a reduction in the ability of the muscles to perform high-intensity activities.

Explanation:

Therefore, a drop in pH during high-intensity interval exercise can have a negative impact on glycogen utilization, leading to decreased energy production and reduced athletic performance.

A.By using the rate law it was discovered that doubling the concentration of Fe(III) doubled the reaction rate, and doubling the concentration of iodide quadrupled the reaction rate.

A chemical reaction's rate law is the mathematical relationship between the rate of the reaction and the concentrations of the reactants. The rate law of a chemical reaction is determined by measuring the initial rate of the reaction at various reactant concentrations.

B.Simply changing the concentration of thiosulfate in solution allows us to see how the rate of reaction changes, If the thiosulfate ion concentration is doubled while the rate of reaction remains constant, the reaction is zeroth order in thiosulfate ion concentration.

C. Nothing happen to the rate of the reaction if the per sulfate concentration was halved.

D.The concentrations of all reactants are held constant. The total volume of the solution has no effect on the rate of the iodine clock reaction.

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The units which are used to represent the volume are mL, L, cm³, m³, etc. The volume of air in liters that you might inhale (and exhale) in 24.0 hours is 10,684.8 L.

The measure of the capacity that an object holds is generally defined as the volume. For example if a beaker can hold 100 mL of water, then its volume is said to be 100mL.

Here in minute, volume is:

15 × 0.495 = 7.42 L

In an hour, volume is:

7.42 × 60 = 445.2

In 24 hours, the volume will be:

Volume = 445.2 × 24 = 10,684.8 L

Thus the volume of air in 24 hours is 10,684.8 L.

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Water is the best insulator because it has the greatest specific heat capacity and all other substances have low specific heat than the water.

The term specific heat capacity is defined as the amount of heat in joules required to increase the temperature of one gram of a substance by one degree Celsius.

An insulator is a substance which conducts heat to a very miserable extent.

From the definition of specific heat capacity and insulator, we conclude that the higher the value of specific heat capacity, the harder it would be to heat up the material, that is, the more heat would be needed.

All the given substances, only water has the greatest specific heat capacity, therefore, it's the best insulator.

Gold is the best conductor, as it has the lowest specific heat capacity.

Thus, the best insulator is water.

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Your question is incomplete, most probably your question was

Table C: Known Specific Heat Values for Common

Materials

Material Specific Heat (J/g*C)

Water 4.18

Concrete 0.88

Wood 1.80

Aluminum 0.90

Glass 0.84

Sand 0.83

Steel 0.49

Iron 0.44

Copper 0.38

Lead 0.16

Gold 0.13

What is the best insulator and why?

Answer:

approximately 6.49x10^-12 meters.

Explanation:

To determine the wavelength of an alpha particle with a kinetic energy of 8.0x10^-13 J, we can use the de Broglie wavelength equation:

wavelength = h / p

where h is Planck's constant and p is the momentum of the particle.

To find the momentum of the alpha particle, we can use the equation:

p = sqrt(2mK)

where m is the mass of the alpha particle, K is its kinetic energy, and sqrt represents the square root.

The mass of an alpha particle is approximately 6.64x10^-27 kg. Substituting the given values, we get:

p = sqrt(2 x 6.64x10^-27 kg x 8.0x10^-13 J) ≈ 1.02x10^-19 kg m/s

Now we can substitute the values of h and p into the de Broglie wavelength equation to get:

wavelength = h / p = 6.626x10^-34 J s / 1.02x10^-19 kg m/s ≈ 6.49x10^-12 m

Therefore, the wavelength of an alpha particle with a kinetic energy of 8.0x10^-13 J is approximately 6.49x10^-12 meters.

Yellow is the correct answer .

Chlorophyll is a green pigment that is essential for the process of photosynthesis in plants, algae, and some bacteria. It absorbs light energy from the sun and converts it into chemical energy, which is then used to produce organic compounds that the organism can use for energy and growth. Chlorophyll is found in specialized organelles called chloroplasts, which are present in the cells of photosynthetic organisms. There are several types of chlorophyll, but the most common types found in plants are chlorophyll a and chlorophyll b. Chlorophyll is also responsible for the green color of leaves and other photosynthetic tissues.

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To determine when the cells are in an isotonic solution, the additional investigation that can be used is option B. Decreasing the salinity of the environment a little at a time until ATP usage reaches a minimum.

An isotonic solution is one where the solute concentration outside the cell is the same as the solute concentration inside the cell. In this state, there is no net movement of water into or out of the cell, and the contractile vacuole does not need to pump out excess water. As the salinity of the environment is decreased, the solute concentration outside the cell will decrease, and water will enter the cell, leading to an increase in the workload of the contractile vacuole. However, when the salinity of the environment is decreased to the point where it becomes isotonic with the cytosol of the cell, the workload of the contractile vacuole will reach a minimum, as there is no more excess water to be pumped out.

Therefore, by decreasing the salinity of the environment a little at a time until the ATP usage reaches a minimum, the experimenter can determine when the cells are in an isotonic solution.

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The best response to the customer's question, "How do I figure out the file extension?" is:

"Look at the letters that follow the dot after the file name."

What is Customer?

A customer is a person or organization that buys or uses goods or services produced by another person or organization. Customers are an essential part of any business or economy, as they create demand for products and services, which in turn drives economic activity.

Customers may be individuals, such as consumers who buy products for personal use, or businesses, which buy products for use in their operations or to sell to their own customers. Customers may also be government agencies, non-profit organizations, or other institutions.

The file extension is typically the letters that follow the last dot in the file name. For example, if the file name is "document.pdf", the file extension is ".pdf". The file extension is used to indicate the type of file and the software that should be used to open it. Knowing the file extension is important because it helps in troubleshooting issues with opening files, as different file types may require different software to open them.

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The precipitation and double displacement reaction are as follows:

What is a precipitation reaction?

Precipitation reactions are ones in which two aqueous solutions containing ions react to form an insoluble solid compound, which is called a precipitate. Precipitation reactions are a type of double displacement reaction, in which cations and anions exchange partners.

These reactions typically occur when two soluble salts are mixed together, resulting in the formation of an insoluble compound. Precipitation reactions are commonly used in analytical chemistry to identify the presence of certain ions in a solution.

The double displacement reaction between silver nitrate (AgNO3) and barium chloride (BaCl2) can be written as follows:

AgNO3(aq) + BaCl2(aq) -> AgCl(s) + Ba(NO3)2(aq)

In this reaction, the silver ion (Ag+) and the chloride ion (Cl-) swap partners to form insoluble silver chloride (AgCl), which precipitates out of solution. The barium ion (Ba2+) and the nitrate ion (NO3-) also swap partners to form soluble barium nitrate (Ba(NO3)2), which remains in solution.

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The formula of the original hydrate is CuSO4 · 5H2O, and its name is copper (II) sulfate pentahydrate.

First we need to use the mass information provided in the problem and the molar masses of the relevant compounds.

First, we can calculate the mass of water that was present in the original hydrate:

Mass of water = Mass of hydrate - Mass of anhydrous salt

Mass of water = 2.50 g - 1.59 g

Mass of water = 0.91 g

Next, we can calculate the number of moles of anhydrous copper (II) sulfate that remained after heating:

Number of moles of anhydrous salt = Mass of anhydrous salt / Molar mass of anhydrous salt

Molar mass of anhydrous copper (II) sulfate = (1 x 63.55 g/mol) + (1 x 32.06 g/mol) + (4 x 16.00 g/mol) = 159.61 g/mol

Number of moles of anhydrous salt = 1.59 g / 159.61 g/mol

Number of moles of anhydrous salt = 0.00997 mol

We can then calculate the number of moles of copper (II) sulfate that were present in the original hydrate:

Number of moles of copper (II) sulfate = Number of moles of anhydrous salt

Number of moles of copper (II) sulfate = 0.00997 mol

Finally, we can use the mass of copper (II) sulfate and the number of moles of copper (II) sulfate to determine the formula and name of the original hydrate. The formula of the hydrate will be in the form of CuSO4 · xH2O, where x is the number of water molecules per formula unit.

The molar mass of CuSO4 is (1 x 63.55 g/mol) + (1 x 32.06 g/mol) + (4 x 16.00 g/mol) = 159.61 g/mol.

The mass of CuSO4 in the original hydrate is 2.50 g - 0.91 g = 1.59 g.

The number of moles of CuSO4 in the original hydrate is therefore 1.59 g / 159.61 g/mol = 0.00997 mol.

The ratio of moles of water to moles of CuSO4 in the original hydrate is:

x = (moles of water) / (moles of CuSO4)

x = (0.91 g / 18.02 g/mol) / 0.00997 mol

x = 5.06

Therefore, the formula of the original hydrate is CuSO4 · 5H2O, and its name is copper (II) sulfate pentahydrate.

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Answer:

17 atoms

Explanation:

So there are two aluminum atoms, three sulfur atoms, and 12 oxygen atoms in a single unit of the compound Al2(SO4)3. This sums to 17.

A number line with 0 in the center and circle -3 to the left of it  represents the solution set for inequality 3x<-9.

A number line is a depiction of a graded single direction that serves as a visual representation of real numbers in primary mathematics. Every point on a number line is believed to correspond to something like a real number, and so every specific number to a point.

Given that the inequality is 3x-9,

Because 3 is a positive number, we may divide this discrepancy by 3 without affecting the less than sign.

i.e. x<-9/3

Or x<-3

Because -3 is strictly less than, we must have a hole at -3. (excluding -3)

Because there is a less than indication, the region on the number line to the left of -3 has a hole at -3.

Therefore, a number line with 0 in the center and circle -3 to the left of it  represents the solution set for inequality 3x<-9.

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Answer:

C.

Explanation:

in CO there are 2 capital letters,but in Co there is 1 capital letter because its an element.

Answer: c. Co is an element and CO is not

Explanation:

Co and CO are two different chemical substances. Co is the metal element named cobalt whereas CO is the inorganic compound i.e. carbon monoxide.

Co is a chemical element with atomic no. 27 and CO is an inorganic compound consisting of atoms of carbon and oxygen.

co is a metal whereas CO is a gas.

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Answer:

The average person is most likely to have Schedule V controlled substances in their homes. These drugs have a low potential for abuse and limited dependence liability compared to other schedule levels. They are often used for medical purposes and include cough syrups containing codeine, anti-diarrhea medications, and some prescription pain medications.

The drugs in other schedule levels, such as Schedule I, II, III, and IV, have a higher potential for abuse and dependence and are considered to be more dangerous and addictive. These schedules include drugs such as cocaine, methamphetamine, fentanyl, and other highly regulated substances.

Explanation:

Answer:

1. A region of land near the ocean can reasonably be expected to experience milder temperatures, higher humidity, and more frequent precipitation due to the influence of the nearby ocean.

2. Weather and climate are influenced by interactions involving the atmosphere, oceans, land, ice, and the sun.

3. Regions of earth with the most evaporation would be those with warm temperatures, high humidity, and plenty of sunshine.

Answer:40 days

- K = [ ln ( 1/2 ) ] / [ t 1/2 ]

- K = [ln ( 1/2 ) ] / 8 = - 0.08664 ( days )^-1

ln C/ C0 = ( - K ) ( t )

C=1mg and C0= 32mg

t = [ ln (1/32 )] / [ - 0.08664 ] = 40 days

The missing nucleus in the equation is 234/90 Th

A nuclear reaction is a procedure wherein an atom's nucleus is altered by being divided or fused with the nucleus of another atom. We know that the masses and the charges that we have in the nuclear reaction must be balanced according to what have been shown in the image that is attached here.

We can then see that the nuclear reaction that is shown in the image is an alpha decay and there is the loss of the helium atom from the system as has been typified in the equation.

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Answer:

(C3H8) produces 660 g of CO2 and 360 g of H2O

Explanation:

The balanced chemical equation for the combustion of propane (C3H8) is:

C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(g)

This equation tells us that for every molecule of propane (C3H8) that reacts with 5 molecules of oxygen (O2), 3 molecules of carbon dioxide (CO2) and 4 molecules of water (H2O) are produced.

So, if we have 220. g of propane (C3H8), we can find the amount of CO2 and H2O produced by using the mole ratio from the balanced equation:

1 mole C3H8 reacts with 5 moles of O2 to produce 3 moles of CO2 and 4 moles of H2O

We can find the number of moles of C3H8 by dividing the mass by the molar mass of C3H8 (44 g/mol):

220 g / 44 g/mol = 5 moles C3H8

So, the number of moles of CO2 and H2O produced can be found by multiplying the number of moles of C3H8 by the mole ratio:

3 moles CO2 = 3 moles CO2/1 mole C3H8 * 5 moles C3H8 = 15 moles CO2

4 moles H2O = 4 moles H2O/1 mole C3H8 * 5 moles C3H8 = 20 moles H2O

Finally, we can convert the number of moles of CO2 and H2O to grams by multiplying by their molar masses (44 g/mol for CO2 and 18 g/mol for H2O):

15 moles CO2 * 44 g/mol = 660 g CO2

20 moles H2O * 18 g/mol = 360 g H2O

So, the combustion of 220 g of propane (C3H8) produces 660 g of CO2 and 360 g of H2O.

The given equations are of the following type:

1. 2 Na + Cl2 = 2NaCl : Combination reaction

2. FeCl2 = Fe + Cl2 : Decomposition reaction

3. C2H4 + 3 O2 = 2CO2 + 2H2O : Combustion reaction

4. F2 + 2 NaBr = 2NaF + Br2 : Single displacement reaction

Combination reaction: Reaction in which two or more elements or compounds join to form a single compound is called a combination reaction.

Decomposition reaction : Reaction in which one reactant breaks own into two or more products is called a decomposition reaction.

Combustion reaction :  Reaction in which a compound and an oxidant is reacted to produce a new product along with heat and light is called a combustion reaction.

Single displacement reaction : Reaction in which one element is replaced by another in a compound during the reaction is called a single displacement reaction

Double displacement reaction: Reaction in which two reactants exchange ions to form two new compounds double displacement reaction.

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