Mole conversions/Percent Composition

Front

What is the empirical formula?

Back

The empirical formula is the simplest whole-number ratio of atoms of each element in a compound.

Front

How do you calculate the number of moles from atoms?

Back

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

Front

What is the molar mass of a substance?

Back

The molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol).

Front

How many molecules are in one mole of a substance?

Back

One mole of any substance contains 6.022 x 10^23 molecules, known as Avogadro's number.

Front

What is the chemical formula for sodium chloride?

Back

The chemical formula for sodium chloride is NaCl.

Front

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

Back

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

Front

What is the molar mass of water (H2O)?

Back

The molar mass of water is 18.02 g/mol.

Front

What is the empirical formula for C6H12O6?

Back

The empirical formula for C6H12O6 is CH2O.

Front

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

Back

There are 1 mole of carbon in 12 grams, since the molar mass of carbon is 12 g/mol.

Front

What is the chemical formula for calcium sulfate?

Back

The chemical formula for calcium sulfate is CaSO4.