Mole Calculations

Front

What is a mole in chemistry?

Back

A mole is a unit of measurement used to express the amount of a substance. It is defined as the amount of substance that contains as many entities (atoms, molecules, etc.) as there are in 12 grams of carbon-12.

Front

How do you calculate the molar mass of a compound?

Back

To calculate the molar mass of a compound, sum the atomic masses of all the atoms in its molecular formula, using the periodic table.

Front

What is Avogadro's number?

Back

Avogadro's number is 6.022 x 10^23, which is the number of atoms, molecules, or particles in one mole of a substance.

Front

How do you convert grams to moles?

Back

To convert grams to moles, divide the mass of the substance (in grams) by its molar mass (in grams per mole).

Front

What is the formula to calculate the number of atoms in a sample?

Back

Number of atoms = (mass of sample in grams / molar mass) x Avogadro's number.

Front

What is the molar mass of water (H2O)?

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The molar mass of water is approximately 18.02 g/mole.

Front

How many moles are in 48 grams of SO2?

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To find the number of moles, divide the mass (48 g) by the molar mass of SO2 (64.07 g/mole), which equals 0.75 moles.

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What is the relationship between moles and molecules?

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One mole of any substance contains Avogadro's number (6.022 x 10^23) of molecules.

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How do you find the mass of a specific number of moles?

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To find the mass of a specific number of moles, multiply the number of moles by the molar mass of the substance.

Front

What is the molar mass of calcium hydroxide, Ca(OH)2?

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The molar mass of calcium hydroxide is 74.1 g/mole.