$\text{C}_2\text{H}_5\text{OH}(l) + 3\text{O}_2(g) \rightarrow 2\text{CO}_2(g) + 3\text{H}_2\text{O}(l)$
The value of enthalpy change ($\Delta H$) for above reaction at $27\,^\circ\text{C}$ is $-1366.5$ kJ $\text{mol}^{-1}$. Then value of internal energy change for the same reaction at this temperature will be

Which of the following processes has $\Delta S$ negative?

Which of the following properties of a system depends upon the amount of matter and path?

The dissociation constant of weak acid HA is $1.5 \times 10^{-5}$. Find the percent dissociation, containing $0.2$ moles per $2$ liters of solution.