Thermodynamics (C)

Which of the following processes is an example of decrease in entropy?

What is the enthalpy of formation of HF if bond enthalpies of H-H, F-F and H-F bonds are $434$ kJ/mol, $158$ kJ/mol and $565$ kJ/mol respectively. ?

Determine the constant external pressure required to compress $2$ mole of an ideal gas from volume $10.8\ \text{dm}^3$ to $5.4\ \text{dm}^3$ if the work obtained is $2460$ J?

The relationship between $\Delta H$ and $\Delta U$ for the reaction, $\text{PCl}_3(g) + \text{Cl}_2(g) \rightarrow \text{PCl}_5(g)$ is given as

If, i) $\text{C} + 2\text{S} \rightarrow \text{CS}_2$, $\Delta H = 117\ \text{kJ}$ ii) $\text{C} + \text{O}_2 \rightarrow \text{CO}_2$, $\Delta H = -393\ \text{kJ}$ iii) $\text{S} + \text{O}_2 \rightarrow \text{SO}_2$,…

Standard enthalpy of vaporization $\Delta_{vap}H^0$ for water at $100^\circ\text{C}$ is 40.66 kJ $\text{mol}^{-1}$. What is the internal energy of vaporization of water at $100^\circ\text{C}$ (in kJ $\text{mol}^{-1}$)?

What is the work done when an ideal gas (0.300 mol) expands in vacuum?

What is the work done in the formation of 1 mole gaseous methane from solid carbon and gaseous hydrogen at $27^\circ\text{C}$? ($R=8.314\ \text{J k}^{-1}\text{ mol}^{-1}$)

Enthalpy of combustion of carbon to carbon dioxide is $-390\ \text{kJ/mol}$. What is the amount of heat released when $35\ \text{g}$ of carbon dioxide is formed from the reaction of carbon and dioxygen gas?

Identify from following reactions that it takes place with $\Delta H = \Delta U$?

A certain organic solvent has $\Delta H\_vap = 28.50\ \text{kJ mol}^{-1}$ and $\Delta S\_vap = 88.2\ \text{J K}^{-1}\ \text{mol}^{-1}$ at 1 bar. Calculate its normal boiling point (where $\Delta G = 0$)?

A gas is compressed by an average pressure of $0.50$ atmosphere, so as to decrease its volume from $400\ \text{cm}^3$ to $200\ \text{cm}^3$. What will be the work done in this case?