How much work is done by the gas when 1.00 g of sodium azide, NaN3 (M = 65.01 g•mol–1), decomposes i — Thermodynamics Chemistry Question

How much work is done by the gas when 1.00 g of sodium azide, NaN₃ (M = 65.01 g•mol–1), decomposes in a container of changeable volume (e.g. an airbag in a car) against a constant pressure of 1.00 atm at 298 K?
2 NaN₃(s)  2 Na(s) + 3 N₂(g)