If one monoatomic gas is expanded adibatically from 2L to 10L at 1 atm external pressure then the value of ΔU (in atm L) is
(AIIMS 2018)
A
−66.7
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B
0
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C
−8
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D
58.2
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Solution
The correct option is C−8 For adiabatic process, no heat is transfered between the system and surrounding, hence,
Q = 0 ∴ΔU=W=−PextΔV =−1(10−2)atmLΔU=−8L