Automobile airbags contain solid sodium azide, NaN3, that reacts to produce nitr

Question

Automobile airbags contain solid sodium azide, NaN3, that reacts to produce nitrogen gas when heated, thus inflating the bag. ----> 2Na(s) + 3N2(g) Calculate the value of w (work) for the following system if 20.2 g of NaN3 reacts completely at 1.00 atm and 22

Explanation / Answer

molecular mass NaN3 = 65.01 g/mol 12.9g NaN3 = 12.9/65 = 0.19843 moles 2 moles NaN3 give 3 moles N2 --> 0.19843 moles Na3 give 0.19843*3/2 moles N2 = 0.297646 moles N2 the volume of 0.297646 moles N2 at 1 atm and 22° is V = nRT/p = 0.2976*0.082*295/1 = 6.32 L volume expansion work against a constant pressure is w = - pV w = - 1.013*10^5 N/m^2* 6.32*10^-3 m^3 = -640 J www.chegg.com/homework-help/questions-and-answers/.

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