For the reaction
$\mathrm{C}_2 \mathrm{H}_6 \longrightarrow \mathrm{C}_2 \mathrm{H}_4+\mathrm{H}_2$
the reaction enthalpy $\Delta_{\mathrm{r}} \mathrm{H}=$ $\_\_\_\_$ $\mathrm{kJ} \mathrm{mol}^{-1}$.
(Round off to the Nearest Integer)....

The average $\mathrm{S}-\mathrm{F}$ bond energy in $\mathrm{kJ} \mathrm{mol}^{-1}$ of $\mathrm{SF}_6$ is $\_\_\_\_$ (Rounded off to the nearest integer)
[Given : The values of standard enthalpy...

For a chemical reaction $\mathrm{A}+\mathrm{B} \rightleftharpoons \mathrm{C}+\mathrm{D}\left(\Delta_{\mathrm{r}} \mathrm{H}^0=\right. 80 \mathrm{~kJ} \mathrm{~mol}^{-1}$ ) the entropy change $\Delta_{\mathrm{r}} \mathrm{S}^0$ depends on the temperature T (in K )...

The ionization enthalpy of $\mathrm{Na}^{+}$formation from $\mathrm{Na}_{(\mathrm{g})}$ is $495.8 \mathrm{~kJ} \mathrm{~mol}^{-1}$, while the electron gain enthalpy of Br is $325.0 \mathrm{~kJ} \mathrm{~mol}^{-1}$. Given the lattice...

The reaction of cyanamide, $\mathrm{NH}_2 \mathrm{CN}_{(\mathrm{s})}$ with oxygen was run in a bomb calorimeter and $\Delta \mathrm{U}$ was found to be $742.24 \mathrm{~kJ} \mathrm{~mol}^{-1}$. The...

The molar heat capacity for an ideal gas at constant pressure is $20.785 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}$. The change in internal energy is 5000 J upon...

While performing a thermodynamics experiment, a student made the following observations,
$...

When 600 mL of $0.2 \mathrm{M} \mathrm{HNO}_3$ is mixed with 400 mL of 0.1 M NaOH solution in a flask, the rise in temperature of...

A gas (Molar mass $=280 \mathrm{~g} \mathrm{~mol}^{-1}$ ) was burnt in excess $\mathrm{O}_2$ in a constant volume calorimeter and during combustion the temperature of calorimeter...

Among the following the number of state variable is ______.
Internal energy (U)
Volume (V)
Heat (q)
Enthalpy (H)