Stoichiometry Practice

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 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 10²³ particles (atoms, molecules, etc.).

Front

How do you determine the mole ratio from a balanced chemical equation?

Back

The mole ratio is determined by the coefficients of the reactants and products in a balanced chemical equation.

Front

In the reaction 2RbNO₃ → 2RbNO₂ + O₂, how many moles of O₂ are produced from 5.0 moles of RbNO₃?

Back

2.5 moles of O₂ are produced.

Front

In the reaction 2H₂ + O₂ → 2H₂O, how many moles of O₂ are consumed when 8 moles of H₂ are used?

Back

4 moles of O₂ are consumed.

Front

What is the mole ratio of MgO to Fe in the reaction 3 Mg + 1 Fe₂O₃ → 3 MgO + 2 Fe?

Back

The mole ratio of MgO to Fe is 3 mol MgO / 2 mol Fe.

Front

What is the mole ratio of CO₂ to H₂O in the reaction C₂H₆O + 3 O₂ → 2 CO₂ + 3 H₂O?

Back

The mole ratio of CO₂ to H₂O is 2 mol CO₂ : 3 mol H₂O.

Front

What is the significance of a balanced chemical equation?

Back

A balanced chemical equation ensures that the number of atoms for each element is conserved in a reaction, reflecting the law of conservation of mass.

Front

What is the purpose of stoichiometric calculations?

Back

Stoichiometric calculations are used to predict the quantities of reactants and products involved in a chemical reaction.

Front

How do you convert grams to moles?

Back

To convert grams to moles, divide the mass of the substance (in grams) by its molar mass (in g/mol).