Stoichiometry - Section 1 Exam

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 molar mass.

Back

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

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 Avogadro's number?

Back

Avogadro's number is 6.022 x 10^23, which is the number of molecules in one mole of a substance.

Front

Calculate the molar mass of AuCl3.

Back

303.3 g/mol.

Front

What is the number of molecules in 0.5 moles of water (H₂O)?

Back

3.011 x 10^23 molecules.

Front

Define percent composition.

Back

Percent composition is the percentage by mass of each element in a compound.

Front

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

Back

Divide the mass of the element in one mole of the compound by the molar mass of the compound, then multiply by 100.

Front

Calculate the percent composition of chlorine in CaCl2.

Back

64%.

Front

What is the mass of 0.89 mol of CaCl2?

Back

98.9 grams.