The standard enthalpy of formation of ammonia gas is

Given : $N_2{H}_4\left(g\right)\to 2N{H}_3\left(g\right);$

$\Delta H_r^{\circ }=-40kJ/mol$ and $\Delta H_f^{\circ }\left[N_2{H}_4\right(g\left)\right]=-120kJ/mol$

Q. The approximate standard enthalpies of formation of methanol and octane are determined to be $-1.5kJ/mol$ and $-10.9kJ/mol$ respectively. The standard enthalpies of combustion of octane is denoted as $\Delta H$ (octane) and that of methanol as $\Delta H$ (methanol). The correct statement is:

Q. Use the given standard enthalpies of formation to determine the heat of reaction of the following reaction: $TiC{L}_4\left(g\right)+2H_{2}O\left(g\right)\to Ti{O}_2\left(g\right)+4HCl\left(g\right)$

Q. The enthalpy change for a reaction $N_2\left(g\right)+3H_2\left(g\right)\to 2N{H}_3\left(g\right)$ is -92.2 kJ/mol. Calculate the enthalpy of formation of ammonia.

Q. Given N₂ +3H2 =2NH3 and standard enthalpy is -92.4kj/mol
Then find the standard enthalpy of formation of nh3 gas