• # question_answer A certain mass of gas is taken from an initial thermodynamic state A to another state B by process I and II. In process I the gas does 5 joules of work and absorbs 4 joules of heat energy. In process II, the gas absorbs 5 joules of heat. The work done by the gas in process II (see figure) is A) +6 joules B) - 6 joules C) +4 joules D) - 4 joules

 [a]$\Delta H=\Delta U+\Delta W$ $\Delta {{U}_{1}}=\Delta {{U}_{2}}$ ${{(\Delta H-\Delta W)}_{1}}=(\Delta H-\Delta W)$ $4-5=5-\Delta W$ $\frac{{{x}^{2}}}{{{a}^{2}}}+\frac{{{y}^{2}}}{{{b}^{2}}}=1$