Stoich Test

Front

What is stoichiometry?

Back

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

Front

What is a mole in chemistry?

Back

A mole is a unit of measurement used to express amounts of a chemical substance, defined as exactly 6.022 x 10^23 particles (atoms, molecules, etc.).

Front

How do you calculate the number of moles from mass?

Back

Number of moles = mass (g) / molar mass (g/mol).

Front

What is the molar mass of O2?

Back

The molar mass of O2 (oxygen gas) is 32 g/mol.

Front

In the reaction 4 Na + O2 -> 2 Na2O, how many moles of Na2O are produced from 4 moles of Na?

Back

2 moles of Na2O are produced.

Front

What is the balanced equation for the combustion of CS2?

Back

CS2 + 3 O2 -> CO2 + 2 SO2.

Front

How many moles of CO2 are produced from 5 moles of CS2?

Back

5 moles of CO2 are produced.

Front

What is the mass of 4 moles of O2?

Back

The mass of 4 moles of O2 is 128 g.

Front

In the reaction B2H6 + 3 O2 -> 2 HBO2 + 2 H2O, how much O2 is needed to burn 28 g of B2H6?

Back

96 g of O2 is needed.

Front

What is the stoichiometric coefficient in a balanced equation?

Back

The stoichiometric coefficient is a number that represents the ratio of moles of each substance in a balanced chemical equation.