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. It is derived from the coefficients of the balanced chemical equation.

Front

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

Back

To determine the number of moles of a product formed, use the mole ratio from the balanced equation and the number of moles of the reactant.

Front

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

Back

10 moles of O2 are produced.

Front

In 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 are needed.

Front

For the reaction 4 FeS + 7 O2 → 2 Fe2O3 + 4 SO2, how many moles of O2 are required to react with 17.3 moles of FeS?

Back

30.3 moles of O2 are required.

Front

In the reaction 2Na + S → Na2S, how many moles of S react with 0.4 moles of Na?

Back

0.2 moles of S react.

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

What is the significance of balancing a chemical equation?

Back

Balancing a chemical equation ensures that the law of conservation of mass is followed, meaning the number of atoms for each element is the same on both sides of the equation.

Front

How do you convert moles of one substance to moles of another in a reaction?

Back

Use the mole ratio from the balanced equation to convert between moles of different substances.

Front

What is the relationship between coefficients in a balanced equation and mole ratios?

Back

The coefficients in a balanced equation represent the number of moles of each substance involved in the reaction, which can be used to determine mole ratios.