(1 ,g) of a liquid is converted to vapour at (3 \times 10^5... | Physics | SolveeIt | Solveeit

Today, August 24

Question

$1 \,g$ of a liquid is converted to vapour at $3 \times 10^5 Pa$ pressure If $10 \%$ of the heat supplied is used for increasing the volume by $1600 \, cm ^3$ during this phase change, then the increase in internal energy in the process will be:

A

$4800 \, J$

B

$4320 \, J$

C

$4.32 \times 10^8 \, J$

D

$432000 \, J$

Answer

$4320 \, J$

Explanation

Solution

Work done =PΔV
=3×105×1600×10−6
=480J
Only 10% of heat is used in work done.
Hence ΔQ=4800J
The rest goes in internal energy, which is 90% of heat.
Change in internal energy =0.9×4800=4320J
The correct answer is (B) : 4320 J