Sodium azide, NaN3, decomposes at high temperatures to form sodium metal, Na, and nitrogen gas, N2. 255.4 grams of sodium azide is placed in a rigid, 75.0-L tank and allowed to decompose at 209.°C. How many moles of nitrogen gas could be formed from the 255.4 grams of sodium azide? moles nitrogen gas What pressure would the nitrogen gas exert in the 75.0-L tank?