Mole to Mole Conversions

Last semester you learned to balance chemical equations.

The coefficients in a balanced equation show molar ratios◦ A molar ratio is the ratio of moles of one

substance to moles of another substance in a balanced chemical equation.

For example: Balance the following equation

___HCl + ___Ba(OH)2 → ___H2O + ___BaCl2 2HCl + 1Ba(OH)2 → 2H2O + 1BaCl2 This equation is saying:

◦ 2 moles of HCl reacts with 1 mole of Ba(OH)2 to form 2 moles of H2O and 1 mole of BaCl2.

◦ Example mole ratio: 2 mole HCl = 2 mol H2O

Based on a balanced chemical reaction, you can predict how many moles of a compound will be produced in a chemical reaction.

Steps for Mole to Mole Conversions:1.Balance the equation2.Remember, the coefficients are a ratio of

moles. Find the mole ratio for what your starting in and what you’re finishing in.

3.Use dimensional analysis to convert to you new “unit”. Your conversion will be the mole ratio.

N2O5 → NO2 + O2

a)How many moles of NO2 can be produced from 4.3 moles of N2O5?

= moles NO2

4.3 mol N2O5

52

2

ON mol2

NO mol48.6

2N2O5(g) 4NO2(g) + O2(g)

4.3 mol ? mol Units match

N2O5 → NO2 + O2

How many moles of O2 can be produced from 4.3 moles of N2O5?

= mole O2

4.3 mol N2O5

52

2

ON 2mol

O mol12.2

2N2O5(g) 4NO2(g) + O2(g)4.3 mol ? mol