Seema Saini Solutions for Chapter: Thermodynamics, Exercise 2: DPP 5.2

The enthalpy change for the reaction $\mathrm{Zn}\left(\mathrm{s}\right)+2{\mathrm{H}}^{+}\left(\mathrm{aq}\right)\to {\mathrm{Zn}}^{2+}\left(\mathrm{aq}\right)+{\mathrm{H}}_2\left(\mathrm{g}\right)$ is $-154.40 \mathrm{kJ} {\mathrm{mol}}^{-1}$. The formation of $2 \mathrm{g}$ of hydrogen expands the system by $22.4$ $\mathrm{L}$ at atmospheric pressure. What is the internal energy change of the reaction?

${\mathrm{H}}_2\mathrm{O}$ is boiled under a pressure of $1.0 \mathrm{atm}$. When an electric current of $0.50 \mathrm{amp}$ from a $12 \mathrm{V}$ supply is passed for $300 \mathrm{s}$ through a resistance in thermal contact with it, it is found that $0.8 \mathrm{g}$ of water is vaporised. Determine the $\mathrm{\Delta E}$ for vaporization of water in $\mathrm{kJ} {\mathrm{mol}}^{-1}$ at the boiling point of water. Given: $\mathrm{R}=8.314 {\mathrm{JK}}^{-1}{\mathrm{mol}}^{-1}$

Difference between $\mathrm{\Delta H}$ and $\mathrm{\Delta U}$ for the reaction involving combustion of one mole of benzene at $300 \mathrm{K}$ is

The standard enthalpies of formation of ${\mathrm{CCl}}_4\left(\mathrm{l}\right), {\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right), {\mathrm{CO}}_2\left(\mathrm{g}\right)$ and $\mathrm{HCl}\left(\mathrm{g}\right)$ are $-107,-242,-394$ and $-93 \mathrm{kJ} {\mathrm{mol}}^{-1}$ respectively. The value of ${\mathrm{\Delta H}}_{300}^0$ for the reaction: ${\mathrm{CCl}}_4\left(\mathrm{l}\right)+2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right)\to {\mathrm{CO}}_2\left(\mathrm{g}\right)+4\mathrm{HCl}\left(\mathrm{g}\right)$ is:

Which of the following chemical reactions have the same heat of reaction at constant pressure and constant volume?

The heat evolved during the combustion of $46 \mathrm{g}$ ethanol in a bomb calorimeter (constant pressure) was determined to be $670.48 \mathrm{kcal} {\mathrm{mol}}^{-1}$at $25°\mathrm{C}$. The value of $\mathrm{\Delta U}$ of the reaction at the same temperature is

Which of the following is/are correct 

For which of the following reaction(s) will $\mathrm{\Delta H}$ and $\mathrm{\Delta E}$ be equal?