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 () to decompose explosively according to the following reaction: What mass of must be reacted to inflate an air bag to 72.0 L at STP?

Question

Chemistry

Brynlee Vazquez

26 February, 21:25

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 () to decompose explosively according to the following reaction: What mass of must be reacted to inflate an air bag to 72.0 L at STP?

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Answers (1)

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Braedon Bowen · Answer 1

the mass required to inflate a 72 L bag is 191.491 g

Explanation:

reaction:

2 NaN3 ↔ 2 Na + 3 N2

conditions:

V = 72.0 L STP: P = 1 atm ∧ T = 298 K

gas law:

PV = RTn R = 0.082 atm * L / K * mol

⇒ n = PV / RT

⇒ n = ((1 atm) * (72.0 L)) / (0.082 atm*L / K*mol) * (298 K)

⇒ n = 2.946 mol

⇒ m = n * Mw = (2.946 mol) * (64.99 g/mol)

⇒ m = 191.491 g