Answer to Question #182097 in General Chemistry for Madison

Question #182097

Air bags are activated when a severe impact causes a steel ball to compress a spring and electrically ignite a detonator cap. This causes sodium azide (NaN3) to decompose explosively according to the following reaction:

 

2 NaN3 (s) à  2 Na (s) + 3 N2 (g)

 

What mass of sodium azide must be reacted to inflate an air bag to 70.0 L at STP?  


1
Expert's answer
2021-04-19T05:14:31-0400

70 L of N2 at STP corresponds to 3.125 moles of N2.


3.125 mole of N2 corresponds to 2.083 moles of NaN3 as per stoichiometric coefficients in the balanced reaction.


2.083 moles of NaN3 correspond to 135.42 g NaN3 as per molar mass of 65.0099.


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