You are asked to design an air bag for a car you know that

Question

You are asked to design an air bag for a car. You know that the bag should be filled with gas with a pressure higher than atmospheric pressure, say 828mm Hg, at a temperature of 22.0 °C. The bag has a volume of 41.5 L. What quantity of sodium azide, NaN₃, should be used to generate the required quantity of gas? The gas-producing reaction is

2 NaN₃(s) → 2 Na(s) + 3 N₂(g)