What mass of NaN3(s) must be reacted to inflate an air bag to 65.5 L at STP?-Chem Webassign?
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) 2 Na(s) + 3 N2(g)
What mass of NaN3(s) must be reacted to inflate an air bag to 65.5 L at STP?
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1 mole of N2 at STP = 22.4 L
65.5 L / 22.4 L/mole = 2.92 moles of N2
2 moles of NaN3 will produce 3 moles of N2
(2/3) x 2.92 = 1.95 moles of NaN3 required
1.95 moles x 65.01 g/mole = 126.7 g (127 g)