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Assuming that water vapour is an ideal gas, the internal energy change `(DeltaU)` when 1 mol of water is vapourised at 1 bar pressure and `100^(@)C`, (Given : Molar enthalpy of vapourisation of water at 1 bar and `373K=41kJmol^(-1)andR=8.3Jmol^(-1)K^(-1)`) will be -

A

`4.100kJmol^(-1)`

B

`3.7904kJmol^(-1)`

C

`37.904kJmol^(-1)`

D

`41.00kJmol^(-1)`

Text Solution

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The correct Answer is:
C
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MOTION-THERMODYNAMICS-EXERCISE - 4 (LEVEL - I)
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  8. Identify the correct statement regarding a spontaneous process -

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  9. Standard entropy of X(2),Y(2)andXY(3) are 60, 40 and 50 JK^(-1)mol^(-1...

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  10. In a fuel cell methanol is used as fuel and oxygen gas is used as an o...

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  11. A diatomic ideal gas is used in a Carnot engine as the working substan...

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  12. For a particular reversible reaction at temperature T, DeltaHandDeltaS...

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  13. The entropy change involved in the isothermal reversible expansion of ...

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  14. In view of the signs of Delta(r)G^(@) for the following reactions : ...

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  15. The incorrect expression among the following is -

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  16. A piston filled with 0.04 mol of an ideal gas expands reversibly from ...

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  17. The following reaction is performed at 298 K ? 2NO(g)+O(2)(g)hArr2NO...

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  18. The heats of combustion of carbon and carbon monoxide are -393.5and-28...

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  19. DeltaU is equal to:

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  20. Given C(("graphite"))+O(2)(g)toCO(2)(g), Delta(r)H^(@)=-393.5kJmol...

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