PYQ NEET- Thermodynamics First Law & Internal Energy

2018:

The change in internal energy of the system is $\Delta U = Q - W = 100 J - 50 J = 50 J$.

2017:

The first law of thermodynamics states that $\Delta U = Q - W$. So, the work done by the system is $W = Q - \Delta U = 80 J - 200 J = -120 J$.

2016:

The work done by the gas is $W = -P\Delta V = -(1.00 atm)(5.00 L - 10.0 L) = 5.00 L\cdot atm$. Since 1 L\cdot atm is equal to 101.325 J, the work done by the gas is $W = 5.00 L\cdot atm \cdot \frac{101.325 J}{1 L\cdot atm} = 506.625 J$.

2015:

The change in internal energy of the