Maharashtra Board Solutions for Chapter: Chemical Thermodynamics, Exercise 3: Exercises

In which of the following, entropy of the system decreases?

The enthalpy of formation for all elements in their standard states is

Which of the following reactions is exothermic?

$6.24 \mathrm{g}$ of ethanol are vaporized by supplying $5.89 \mathrm{kJ}$ of heat. Enthalpy of vaporization of ethanol will be

If the standard enthalpy of formation of methanol is $-238.9 \mathrm{kJ}{ \mathrm{mol}}^{-1}$ then entropy change of the surroundings will be

Which of the following are not state functions?

1. $\mathrm{Q}+\mathrm{W}$

2. $\mathrm{Q}$

3. $\mathrm{W}$

4. $\mathrm{H}-\mathrm{TS}$

For vaporization of water at 1 bar, $\mathrm{\Delta H}=40.63 \mathrm{kJ} {\mathrm{mol}}^{-1}$ and $\mathrm{\Delta S}=108.8 \mathrm{J} {\mathrm{K}}^{-1} {\mathrm{mol}}^{-1}$. At what temperature, $\mathrm{\Delta G}=0$?

Bond enthalpies of $\mathrm{H}-\mathrm{H}, \mathrm{Cl}-\mathrm{Cl}$ and $\mathrm{H}-\mathrm{Cl}$ bonds are $434 \mathrm{kJ}{ \mathrm{mol}}^{-1},242 \mathrm{kJ} {\mathrm{mol}}^{-1}$ and $431 \mathrm{kJ}{ \mathrm{mol}}^{-1}$, respectively. Enthalpy of formation of $\mathrm{HCl}$ is