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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

`40.3 kJ//mol`

B

`43.2 kJ//mol`

C

`4.03 kJ//mol`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
A
1 watt = 1 J/sec
Total heat supplied for 36 mL `H_(2)O`
`" "=806 xx 100`
`" "=80600 J`
`" "DeltaH_("vap")=(80600)/(36)xx18`
`" "=40300" J or 40.3 kJ"//"mol"`
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