1   g of a liquid is converted to vapour at 3 × 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 :

Question

1 &#160; g of a liquid is converted to vapour at 3 &#215; 10 5 &#160; Pa pressure. If 10 % of the heat supplied is used for increasing the volume by 1600 &#160; cm 3 during this phase change, then the increase in internal energy in the process will be :

Aicharya · Accepted Answer

As pressure against which expansion is happening is constant, work done can be written as $= P Δ V$

$= (3 \times 10^{5}) \times (1600 \times 10^{- 6})$

$= 480 J$
As only $10 %$ of heat is used in work done.
Hence $Δ Q = \frac{W}{0.1} = 4800 J$
The rest goes in increase in internal energy, which is $90 %$ of heat.
Change in internal energy $= 0.9 \times 4800 = 4320 J$

1   g of a liquid is converted to vapour at 3 × 10 5   Pa pressure. If 10 % of the heat…

Solution

1 &#160; g of a liquid is converted to vapour at 3 &#215; 10 5 &#160; Pa pressure. If 10 % of the heat…

Solution

1 g of a liquid is converted to vapour at 3 × 10 5 Pa pressure. If 10 % of the heat…