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36 mL of pure water takes 100 sec to eva...

36 mL of pure water takes 100 sec to evaporate from a vessel when a heater of 806 watt is used. The `DeltaH_("vaporisation")` of `H_(2)O` is (density of water `=1g//c c)`

A

`40.3kJ//mol e`

B

43.2 kJ/mole

C

4.03 kJ/mole

D

none

Text Solution

Verified by Experts

The correct Answer is:
A
1 watt=1J/sec
Total heat for 36 mL `H_(2)O`
`=806xx100` ltbr. `=80600J`
`DeltaH_("vaporisation")=(80600)/(36)xx18`
`=40300J` or `40.3kJ//mol e`
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Knowledge Check

  • 50 ml of water takes 5 minutes to evaporate from a vessel on a heater connected to an electric source which delivers 400 W. The enthalpy of vaporization of water is ________ .

    A
    40.3 kJ `mol^-1`
    B
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    C
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    D
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  • A thermally insulated vessel contains 150g of water at 0^(@)C . Then the air from the vessel is pumped out adiabatically. A fraction of water turms into ice and the rest evaporates at 0^(@)C itself. The mass of evaporated water will be closest to : (Latent heat of vaporization of water =2.10xx10^(6)jkg^(-1) and Latent heat of Fusion of water =3.36xx10^(5)jkg^(-1) )

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    B
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