Mole conversions/Percent Composition

Front

What is a mole?

Back

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

Front

How do you convert atoms to moles?

Back

To convert atoms to moles, divide the number of atoms by Avogadro's number (6.02 x 10^23).

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 (g/mol).

Front

What is percent composition?

Back

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

Front

How do you calculate percent composition?

Back

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

Front

What is the molar mass of magnesium (Mg)?

Back

The molar mass of magnesium (Mg) is approximately 24.31 g/mol.

Front

What is the molar mass of sulfur (S)?

Back

The molar mass of sulfur (S) is approximately 32.07 g/mol.

Front

What is the molar mass of oxygen (O)?

Back

The molar mass of oxygen (O) is approximately 16.00 g/mol.

Front

How many grams are in 1 mole of a substance?

Back

1 mole of a substance contains a mass equal to its molar mass in grams.

Front

How do you find the number of atoms in a given mass of an element?

Back

To find the number of atoms, convert grams to moles, then multiply by Avogadro's number.