Chemical Thermodynamics Quiz 3

For the reaction $N_{2(g)}$ + $3H_{2(g)}$ = $2NH_{3(g)}$ ; Which of the following is valid ?

The heat of combustion of carbon is 394 kJ $mol^{-1}$ . The heat evolved in combustion of $6.023 \times 10 ^{22}$ atoms of carbon is

Which of the reactions defines the heat of formation ?

$\Delta U^\circ$ of combustion of methane is -X kJ $mol^{-1}$ . The value of $\Delta H^\circ$ is

The enthalpy of combustion of 5(rhomic)is -297.4 kJ $\text {mol}^{-1}.$ The amount of sulphur required to produce 29.74 kJ of heat is

The heat of formation of $SO_{2(g)}$ and $SO_{3(g)}$ are -269 kJ $mol^{-1}$ and -395 kJ $mol^{-1}$ respectively the value of ΔH for the reaction $SO_{2(g)} + \frac{1}{2}O_{2(g)} \rightarrow SO_{3(g)}$ is

The enthalpy of combustion of methane, graphite and dihydrogen at 298 K are, -890.3 kJ $mol^{-1}$ , -393.5 kJ $mol^{-1}$ and -285.8 kJ $mol^{-1}$ respectively. Enthalpy of formation of $CH_{4(g)}$ will be

The enthalpies of formation of $N_2 O_{(g)}$ and $NO_{(g)}$ are 82 kJ $mol^{-1}$ and 90 kJ $mol^{-1}$ respectively. Then enthalpy of a reaction $2N_2 O_{(g)} + O_{(g)} \rightarrow 4NO_{(g)}$ is ………

The heat of combustion of naphthalene $(C_{10} H_8 )$ to $CO_2$ gas and water vapour at 298 K and at constant pressure is $-5.1567\times 10 ^6 J.$ The heat of combustion at constant volume at 298 K is $(R = 8.314 \, JK ^{-1}\,mol ^{-1})$ :

Given the reaction,

$2 NH _ 3 (g) \rightarrow N_{2 (g)} + 3 H _{2 (g)} \triangle H = 92.6 kJ$

The enthalpy of formation of $NH_3$ is :