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1. Heat(q) and work done (W) individually are not state functions but their sum is always a state function. Explain why?
2. Calculate the standard enthalpy change $(\Delta_\text{r}\text{H}^\theta)$ and standard internal energy change $(\Delta_\text{r}\text{U}^\theta)$ for the following reaction at 300K:

$OF_2(g) + H_2O(g) + O_2(g) + 2HF(g)$
Standard enthalpy of formation $(\Delta_\text{r}\text{H}^\theta)$ of e n various species are given below:
$\Delta_\text{f}\text{H}^\theta\text{kJ mol}^{-1}: OF_2(g) = 23.0, H_2O(g)= -241.8, HF(g) = -268.6, R = 8.314 JK^{-1}mol^{-1}$.