The letent heat of caporisation of water is `2240 J` if the work done in the precess of caporization of `1g` is 148J` then increases in initial energy will be

Options

A. `1904J`
B. `2072 J`
C. `2240 J`
D. `2408 J`

Answer

b

Explanation

From first law of thermodyamics , we have
`Delta U = Q - W`
Which state that if an amount of beat Q is given to a system a part of it will be used increasing the initial work `(W)`.
`:.` We have `Q = ML = 1 xx 2240 J`
and `W = 168 J`
`:. Delta U = 2340 - 168 = 2072 J`.