Mole Conversion Practice Problems (Elements)

Front

What is a mole in chemistry?

Back

A mole is a unit of measurement used to express amounts of a chemical 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

What is the molar mass of an element?

Back

The molar mass of an element is the mass of one mole of that element, typically expressed in grams per mole (g/mol). It is numerically equivalent to the atomic mass of the element.

Front

How do you calculate the number of moles from the number of atoms?

Back

To calculate the number of moles from the number of atoms, use the formula: Number of moles = Number of atoms / Avogadro's number (6.022 x 10^23).

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 moles to grams?

Back

To convert moles to grams, use the formula: Mass (g) = Number of moles x Molar mass (g/mol).

Front

What is the molar mass of silver (Ag)?

Back

The molar mass of silver (Ag) is 107.87 g/mol.

Front

How many grams are in 2 moles of carbon (C)?

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To find the mass, use the molar mass of carbon (12.01 g/mol): Mass = 2 moles x 12.01 g/mol = 24.02 g.

Front

How many moles are in 12 grams of carbon (C)?

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To find the number of moles, use the molar mass of carbon (12.01 g/mol): Moles = 12 g / 12.01 g/mol ≈ 1 mole.

Front

What is the mass of 3 moles of gold (Au)?

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The molar mass of gold (Au) is 196.97 g/mol. Mass = 3 moles x 196.97 g/mol = 590.91 g.

Front

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

Back

To find the number of atoms, use the formula: Number of atoms = Number of moles x Avogadro's number (6.022 x 10^23).