1.

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/moleC. 4.03 kJ/moleD. none

Answer» Correct Answer - 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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