Front

What is stoichiometry?

Back

Stoichiometry is the branch of chemistry that deals with the calculation of reactants and products in chemical reactions based on the conservation of mass.

Front

Define molecular formula.

Back

A molecular formula shows the actual number of atoms of each element in a molecule of a compound.

Front

Define empirical formula.

Back

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

Front

How do you determine the molecular formula from the empirical formula?

Back

To find the molecular formula, multiply the subscripts in the empirical formula by a whole number that makes the molar mass of the compound equal to the given molar mass.

Front

What is the molar mass of CCl2?

Back

The molar mass of CCl2 is approximately 98.9 g/mol.

Front

What is the molar mass of C2Cl4?

Back

The molar mass of C2Cl4 is approximately 165.8 g/mol.

Front

What is the balanced equation for the combustion of C3H8?

Back

C3H8 + 5 O2 -> 3 CO2 + 4 H2O.

Front

If 2.13 moles of C3H8 are burned, how many moles of CO2 are produced?

Back

6.39 moles of CO2 are produced.

Front

What is the stoichiometric ratio of Mg to H2O in the reaction Mg + 2H2O -> Mg(OH)2 + H2?

Back

The stoichiometric ratio is 1:2.

Front

How many grams of H2O are needed to react with 3.6 x 10^5 grams of Mg?

Back

5.4 x 10^5 grams of H2O are needed.