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An immersion heater, in an insulated ves...

An immersion heater, in an insulated vessel of negligible heat capacity brings 100 g of water to the boiling point from `16^@C` in 7 min. Then
Q. Power of heat is nearly

A

`854 J//Kg`

B

`854xx10^(3) J//kg`

C

`204 cal//g`

D

`204 cal//kg`

Text Solution

Verified by Experts

The correct Answer is:
B
Heat required to vapourize it at `78^@C`
`Q_v=Pt_3=(20cal)(306s)`
If L is the heat vapourization of alcohol
`Q_v=m_3L`
`L=((20xx306)cal)/(30g)=204(cal)/(g)=854(J)/(g)`
`=854xx10^3(J)/(kg)`
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