Identify the different types of bonds present in quaternary ammonium salts.

A syringe has a volume of $10.0\ \text{cm}^3$ at a pressure of $1$ atm. If the end is sealed and the plunger is pushed down (constant temperature), what will be the final volume when the pressure becomes $3.5$ atm?

The equilibrium constant for a reaction is $100$. What will be the value of standard Gibbs energy change at $298$ K ? ($R = 8.314$ J $\text{K}^{-1}\text{mol}^{-1}$)

The bond dissociation enthalpy of $\text{H}_2$, $\text{Cl}_2$ and HCl are $434$, $242$ and $431$ kJ $\text{mol}^{-1}$ respectively. Calculate the enthalpy of formation of HCl.