Mole Ratios & Mole to Mole Calculations

Front

What is a mole ratio?

Back

A mole ratio is a ratio that relates the amounts in moles of any two compounds involved in a chemical reaction, derived from the coefficients of a balanced chemical equation.

Front

Where does the mole ratio come from?

Back

The coefficients of the balanced chemical equation.

Front

How do you calculate moles of a product from moles of a reactant?

Back

Use the mole ratio from the balanced equation to convert between moles of reactants and products.

Front

Given the reaction 2 C2H6 + 7 O2 → 4 CO2 + 6 H2O, how many moles of CO2 are produced from 17.5 moles of O2?

Back

10.0 moles of CO2.

Front

In the reaction 2 KClO3 → 2 KCl + 3 O2, how many moles of O2 are produced from 6.7 moles of KClO3?

Back

10.0 moles of O2.

Front

For the reaction S8 + 12 O2 → 8 SO3, how many moles of S8 are needed to react with 3 moles of O2?

Back

0.3 moles of S8.

Front

In the reaction N2 + 3H2 → 2NH3, how many moles of N2 are needed to produce 3.5 moles of NH3?

Back

1.8 moles of N2.

Front

What is the significance of coefficients in a balanced chemical equation?

Back

Coefficients indicate the relative number of moles of each substance involved in the reaction.

Front

How do subscripts in a chemical formula differ from coefficients?

Back

Subscripts indicate the number of atoms of an element in a molecule, while coefficients indicate the number of molecules or moles.

Front

What is the first step in solving a mole-to-mole calculation?

Back

Write and balance the chemical equation.