Molar Mass, Mole Conversion and Percent Composition

Front

What is molar mass?

Back

The molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). It is calculated by summing the atomic masses of all atoms in a molecule.

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How do you convert moles to grams?

Back

To convert moles to grams, use the formula: grams = moles × molar mass.

Front

What is a mole?

Back

A mole is a unit in chemistry that represents 6.02 x 10^23 particles (atoms, molecules, ions, etc.) of a substance.

Front

How do you calculate the number of atoms in a given number of moles?

Back

Multiply the number of moles by Avogadro's number (6.02 x 10^23).

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What is percent composition?

Back

Percent composition is the percentage by mass of each element in a compound.

Front

How do you calculate the percent composition of an element in a compound?

Back

Percent composition = (mass of element in 1 mole of compound / molar mass of compound) × 100%.

Front

What is Avogadro's number?

Back

Avogadro's number is 6.02 x 10^23, which is the number of particles in one mole of a substance.

Front

How do you find the number of moles from grams?

Back

To find the number of moles from grams, use the formula: moles = grams / molar mass.

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Calculate the number of moles in 12 grams of carbon. (C = 12 g/mol)

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1 mole of carbon.

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Calculate the number of grams in 2 moles of water. (H2O = 18 g/mol)

Back

36 grams of water.