Stoichiometry Problem

Question

According to the balanced reaction below, calculate the moles of NO2 that form when 5.20x10^-3 mol of N2O5 completely reacts: 2 N2O5(g) yields 4 NO2(g)+O2(g)

Answer 1

2N₂O₅(g) ==> 4 NO₂(g) + O₂(g) ... balanced equation

To find moles of NO₂ that forms, we need to look at the mol ratio of N₂O₅ to NO₂. It is 2:4 or 1:2. We are given moles of N₂O₅ and so can easily find moles of NO₂. We will use dimensional analysis to do this.

moles N₂O₅ = 5.20x10^-3 moles

moles NO₂ formed = 5.20x10^-3 mol N₂O₅ x 4 mol NO₂ / 2 mol N₂O₅ = 10.4x10^-3 mol = 1.04x10^-2 mol NO₂