Chemistry - Thermodynamics - I Question with Solution | TestHub

Consider a system consisting of 100 gm of a liquid '4' present in an insulated beaker at 1 bar pressure. The liquid has been heated a heating coil operated by a 24 V battery, which provides a constant current of 2A, for 500 seconds under the influence of constant ${\mathrm{P}}_{\mathrm{ext}}$ of 1 bar. During heating $80\%$ of liquid has converted into vapours. Calculate change in internal energy of system,

Given : density of A(l) = 1.4 g/ml

density of A(g) = 0.6 g/mol

1 litre-bar = 700 J