Answer to Question #286958 in General Chemistry for Jims

Question

One of the reactions used to inflate automobile air bags involves sodium azide 

(NaN3). The balanced equation will be: 2NaN3(s) → 2Na(s) + 3N2(g). Determine the mass of N2

produced from the decomposition of 100.0 g of NaN3.

Answer 1

first convert 75.0 g to Moles by dividing by 28g/mol. = 2.68 moles N₂

Based on the balanced equation reactants to product ratio are 2:3 for Azide: Nitrogen gas. This means for every 3 moles of Nitrogen gas produces, 2 moles of Sodium Azide are needed.

This is a dimensional analysis question by using the fence method.

Start with moles calculated from above.

2.68 Moles N₂ *(2 moles NaN₃/3 moles N₂)=1.79mol NaN₃(65g/mol)= 116.35 g or with sig. figs 116g NaN₃