Chemistry problem?

Automotive air bags inflate whwn sodium azide, NaN3, rapidly decomposes to fit its component elements:

2NaN3(s) ----- 2Na(s) + 3N2(g)

If an airbag has a volume of 36L and is to be filled with nitrogen gas at a pressure of 99.8 kpa at a temerature of 21.0C, how many grams of soium azide must be decomposed.

Answer:
Use the Ideal gas law state as: PV=nRT

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