Stoichiometry Calculation-Practice Test

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

What does a coefficient in a chemical equation represent?

Back

A coefficient represents the number of moles of a substance involved in a chemical reaction.

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 empirical formula?

Back

The empirical formula is the simplest whole-number ratio of elements in a compound.

Front

How do you determine the empirical formula from percentage composition?

Back

Convert the percentages to grams, then to moles, and find the simplest mole ratio.

Front

What is the molar mass of water (H2O)?

Back

The molar mass of water is 18.02 g/mol.

Front

If 3 moles of H2 react with 1 mole of O2, how many moles of water are produced?

Back

2 moles of water are produced.

Front

What is the balanced equation for the combustion of propane (C3H8)?

Back

C3H8 + 5O2 → 3CO2 + 4H2O.

Front

What is the significance of the law of conservation of mass in stoichiometry?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction, which is fundamental for balancing equations.

Front

How do you convert grams to moles?

Back

To convert grams to moles, divide the mass of the substance by its molar mass.