Calculating Moles

Front

What can be determined from a balanced chemical equation?

Back

Mole ratio of any two substances in the reaction.

Front

What is Avogadro's Number?

Back

6.02 x 10^23.

Front

What is the empirical formula of the molecular formula C3H6?

Back

CH2.

Front

How do you calculate the empirical formula from percentage composition?

Back

Convert the percentages to grams, divide by the molar mass of each element, and find the simplest whole number ratio.

Front

What is the empirical formula if you have 36.84% nitrogen and 63.16% oxygen?

Back

N2O3.

Front

What does one mole of a substance represent?

Back

Avogadro's number of representative particles.

Front

How do you convert moles to grams?

Back

Multiply the number of moles by the molar mass of the substance.

Front

What is the molar mass of water (H2O)?

Back

18.02 g/mol.

Front

What is the significance of the mole in chemistry?

Back

It provides a bridge between the atomic and macroscopic worlds, allowing chemists to count particles by weighing.

Front

What is the relationship between moles and volume for gases at STP?

Back

1 mole of any gas occupies 22.4 liters at standard temperature and pressure (STP).