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 the molar mass of a compound?

Back

The molar mass of a compound is the mass of one mole of that compound, expressed in grams per mole (g/mol).

Front

How do you calculate the molar mass of NaCl?

Back

To calculate the molar mass of NaCl, add the atomic masses of sodium (Na, 22.99 g/mol) and chlorine (Cl, 35.45 g/mol): 22.99 + 35.45 = 58.44 g/mol.

Front

What is the balanced equation for the combustion of methane (CH4)?

Back

The balanced equation is: CH4 + 2O2 → 2H2O + CO2.

Front

How do you determine the mass of a product formed in a reaction?

Back

Use stoichiometric ratios from the balanced equation and the molar mass of the reactants and products.

Front

What is the mole ratio in the reaction 2Na + 2H2O → 2NaOH + H2?

Back

The mole ratio is 2:2:2:1 for Na: H2O: NaOH: H2.

Front

How many grams of hydrogen are produced from 120 g of sodium (Na)?

Back

5.2 g of hydrogen are produced when 120 g of sodium reacts.

Front

What is the mole ratio of H2 to O2 in the reaction 2H2 + O2 → 2H2O?

Back

The mole ratio is 2 moles of H2 to 1 mole of O2.

Front

How many moles of NH3 are produced from 1 mole of H2 in the reaction N2 + 3H2 → 2NH3?

Back

2/3 moles of NH3 are produced from 1 mole of H2.

Front

If 8 moles of H2 are used, how many moles of O2 are consumed?

Back

4 moles of O2 are consumed when 8 moles of H2 are used.