Question

Calculate the change in internal energy of a gas kept in a rigid container when 100 J of heat is supplied to it.

Answer 1

Change in internal energy is 100 J

Explanation:

Given,

dQ = 100 J

According to first law ,

dQ = du + dw

du = dQ - dw

if the container is rigid so,

 dv = 0

then , dw = $p\times dv$

          dw = $p\times {0}$

          dw = 0

Now we get,

du = dQ

du = 100 J

Change in internal energy is 100 J