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nexus9112 [7]
3 years ago
6

Air bags are activated when a severe impact causes a steel ball to compress a spring and electrically ignite a detonator cap. Th

is 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?
Chemistry
1 answer:
Vlada [557]3 years ago
7 0

Answer:

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

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See explanation.

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Hello!

In this case, since we know the heat of reaction per gram of reactant and we should know the total energy of reaction, but it is not there, we are going to assume it is 1200 J as usual in these problems, so you can change it to whatever your given heat is.

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Heat that can actually be felt is considered to be sensible heat. Instead of the phase shifting, energy is what causes the temperature to vary as it moves from one system to another. For instance, it warms the water instead of melting the ice.

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