1 mole of an ideal gas is compressed isothermally and reversibly from initial pressure $x$ kPa to final pressure $2x$ kPa at 300 K. Find the work done $(R = 8.314\ \text{J K}^{-1}\text{mol}^{-1})$

Which of the following is the correct expression of the first law of thermodynamics for adiabatic processes ?

Calculate the standard enthalpy change for the following reaction,
$2\text{C}_2\text{H}_6\text{(g)} + 7\text{O}_2\text{(g)} \longrightarrow 4\text{CO}_2\text{(g)} + 6\text{H}_2\text{O}\text{(l)}$
Given, $\Delta_f H^\circ(\text{C}_2\text{H}_6) = -85\ \text{kJ mol}^{-1}$
$\Delta_f H^\circ(\text{CO}_2) = -390\ \text{kJ mol}^{-1}$
$\Delta_f H^\circ(\text{H}_2\text{O}) = -285\ \text{kJ mol}^{-1}$

The solubility of salt $\text{AX}_2$ is $6 \times 10^{-12}\ \text{mol dm}^{-3}$. What is solubility product of the salt ?