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How much work is done by the gas when 1....

How much work is done by the gas when `1.00g` of sodium azide, `NaN_(3)` (`M=65.01 gxxmol^(-1)`), decomposes in a container of changeable volume (e.g. and airbag in a car) against a constant pressure of 1.00 atm at 298K?
`2NaN_(3)(s)to2Na(s)+3N_(2)(g)`

A

`+114 J`

B

`+57.2J`

C

`-114J`

D

`-57.2J`

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The correct Answer is:
D
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