Stoichiometry: Mole to Mass

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

How do you calculate the molar mass of a compound?

Back

To calculate the molar mass, sum the atomic masses of all the atoms in the compound's formula.

Front

What is the molar mass of propane (C3H8)?

Back

44 g/mol.

Front

What is a balanced chemical equation?

Back

A balanced chemical equation has equal numbers of each type of atom on both sides of the equation, reflecting the law of conservation of mass.

Front

What is the mole ratio in a chemical reaction?

Back

The mole ratio is the ratio of moles of one substance to moles of another substance in a balanced chemical equation.

Front

Using the equation 2 Cu + O2 -> 2 CuO, what is the mole ratio of Cu to O2?

Back

The mole ratio of Cu to O2 is 2:1.

Front

Using the equation 2 HBr + Ca(OH)2 -> H2O + CaBr2, what is the mole ratio between H2O and HBr?

Back

1 mol H2O / 2 mol HBr.

Front

How do you determine the grams of a substance needed from moles?

Back

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

Front

Using the equation 2C4H10 + 13O2 -> 10H2O + 8CO2, how many grams of C4H10 are needed to produce 5.12 moles of CO2?

Back

74.2 g C4H10.

Front

What is the molar mass of nitrogen gas (N2)?

Back

28 g/mol.