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 in a balanced equation.

Front

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

Back

To determine the mole ratio, look at the coefficients in front of each substance in the balanced equation. These coefficients represent the number of moles of each substance.

Front

In the reaction 2 C2H6 + 7 O2 → 4 CO2 + 6 H2O, what is the mole ratio of CO2 to H2O?

Back

The mole ratio of CO2 to H2O is 4:6, which simplifies to 2:3.

Front

If 2 moles of N2 react with 3 moles of H2 to produce 2 moles of NH3, how many moles of H2 are needed for 2 moles of N2?

Back

6 moles of H2 are needed.

Front

In the reaction 2H2 + O2 → 2H2O, how many moles of H2O are produced from 8 moles of H2?

Back

8 moles of H2O are produced.

Front

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

Back

The mole ratio of C2H6 to O2 is 2:7.

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

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 of each element is the same on both sides of the equation.

Front

What does the coefficient in a balanced equation represent?

Back

The coefficient represents the number of moles of that substance involved in the reaction.

Front

How can mole ratios be used in stoichiometry?

Back

Mole ratios can be used to convert between moles of reactants and products in stoichiometric calculations.