Air bags are activated when a severe impact causes a steel ball to compress a spring and electrically ignite a detonator cap. This action causes sodium azide (NaN3) to decompose explosively according to the following reaction:
2NaN3(s)⟶2Na(s)+3N2(g)
What mass of NaN3(s) must be reacted to inflate an air bag to 70.0 L at STP?