Mole Conversions/Percent Composition/Empirical Formula Practice

Front

What is a mole in chemistry?

Back

A mole is a unit of measurement used to express amounts of a chemical substance, defined as exactly 6.022 x 10^23 particles (atoms, molecules, ions, etc.).

Front

How do you convert moles to grams?

Back

To convert moles to grams, multiply the number of moles by the molar mass of the substance (in g/mol).

Front

What is the molar mass of Carbon (C)?

Back

The molar mass of Carbon (C) is approximately 12.01 g/mol.

Front

How many atoms are in 1 mole of a substance?

Back

1 mole of a substance contains approximately 6.022 x 10^23 atoms.

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

To calculate percent composition, divide the mass of each element in a compound by the total mass of the compound and multiply by 100.

Front

What is an empirical formula?

Back

An empirical formula is the simplest whole-number ratio of elements in a compound.

Front

How do you determine the empirical formula from percent composition?

Back

Convert the percent composition to grams, then to moles, and find the simplest ratio of moles of each element.

Front

What is the molar mass of Neon (Ne)?

Back

The molar mass of Neon (Ne) is approximately 20.18 g/mol.

Front

How do you find the mass of a substance from moles?

Back

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