Chemistry - Thermodynamics - 1 Question with Solution | TestHub

Given, q = + 701 J (heat is absorbed, heance q is positive.)

W = - 394 J (work is done by the system, hence W is negative.)

By first law of thermodynamics;

Internal energy change,$\Delta \text{U}=\text{q}+\text{w}$
= + 701 J + (-394 J ) = + 307 J.

Hence, internal energy of the system increases by 307 J.