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One litre of dry air STP undergoes throu...

One litre of dry air STP undergoes through an adiabatic process and reaches to a final temperature of 89.6 °C, the work done by air is : [Take air to be an ideal gas and `gamma_("air")=1.4` use R`=8.3J mol^(-1)K^(-1)]`

A

`83 J`

B

`-83 J`

C

`1859.2 J`

D

`-1859.2 J`

Text Solution

Verified by Experts

The correct Answer is:
B
`W = (nR(T_ T_2))/(gamma - 1) = (1/22.4) xx (8.3 (273 - (273 + 89.6)))/((1.4 - 1))`
`= (-8.3 xx 89.6)/(22.4 xx 0.4)`
` = 083 J`
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