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If 1.0 kcal of heat is added to 1.2 L ...

If 1.0 kcal of heat is added to 1.2 L of `O_(2)` in a cyclinder of constant pressure of 1 atm , the volume increase to 1.5 L . Calculate `DeltaU` and `DeltaH`of the process.

Text Solution

Verified by Experts

`Delta H=` heat added at constant pressure `= 1 kcal`
`Delta U=q+W`
`W= -P_(ext)(V_(2)-V_(1))= -1(1.5-1.2)= -0.31L-atm= -30 J`
`= -30 J`
`Delta U=4200-30=4170 J`
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Knowledge Check

  • When 1 mole of an ideal gas at 20 atm pressure and 15 L volume expands such that the final pressure becomes 10 atm and the final volume becomes 60 L. Calculate entropy change for the process (C_(p.m)=30.96 J "mole"^(-1) K^(-1))

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  • A quantity of an ideal gas at 20^(@)C reversibly expands against a constant pressure of 2.0 atm from 1.0 L to 2.0 L. Calculate the work done

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