Mole Ratios & Mole to Mole Calculations

Front

What is a mole ratio?

Back

A mole ratio is a ratio that shows the relative amounts of moles of reactants and products in a chemical reaction, derived from the coefficients of the balanced 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 moles of the reactant to moles of the product.

Front

Given the equation: 2H2 + O2 → 2H2O, how many moles of H2O are produced from 4 moles of H2?

Back

4 moles of H2O are produced.

Front

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

Back

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

Front

In the reaction: N2 + 3H2 → 2NH3, how many moles of H2 are needed for 1 mole of N2?

Back

3 moles of H2 are needed.

Front

What is the mole ratio of CO2 to H2O in the reaction: 2 C2H6 + 7 O2 → 4 CO2 + 6 H2O?

Back

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

Front

If 10 moles of O2 react in the equation 2 C2H6 + 7 O2 → 4 CO2 + 6 H2O, how many moles of CO2 are produced?

Back

5.7 moles of CO2 are produced.

Front

What is the total number of moles of S that reacts when 0.4 moles of Na are consumed in the reaction 2Na + S → Na2S?

Back

0.2 moles of S react.

Front

How do you determine the limiting reactant in a chemical reaction?

Back

The limiting reactant is the reactant that is completely consumed first, limiting the amount of product formed.

Front

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

Back

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