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AIIMS 201826 May
Exam
AIIMS
Year
2018
Date
26 May
Subject
Chemistry
Chapter
Thermodynamics (C)

AIIMS 2018 · 26 May · Chemistry · Thermodynamics (C)

If one monoatomic gas is expanded adibatically from 2 ~L to 10 ~L...

If one monoatomic gas is expanded adibatically from 2 L2 \mathrm{~L} to 10 L10 \mathrm{~L} at 1 atm1 \mathrm{~atm} external pressure then the value of ΔU\Delta U (in atm L\mathrm{L} ) is

Options

  1. A−8-8
  2. B00
  3. C−66.7-66.7
  4. D58.258.2

Correct answer

A. −8-8

Step-by-step solution

Q=0(∵ process is adiabatic. )ΔU=w=−PextΔV=−1(10−2) atm L=−8 atm L \begin{aligned} & Q=0 \quad(\because \text{ process is adiabatic. }) \\ & \Delta U=w=-P_{\mathrm{ext}} \Delta V \\ & =-1(10-2) \text{ atm } \mathrm{L}=-8 \text{ atm L } \\ & \end{aligned}
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