Enthalpies of formation of CCl_{4(g)},H_2O_{( | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(C) The enthalpy of reaction is calculated using the formula: $\Delta_{r}H^{\circ} = \sum \Delta_{f}H^{\circ}(	ext{products}) - \sum \Delta_{f}H^{\ci

Vedclass · Accepted Answer

$173$

Vedclass · Answer

(C) The enthalpy of reaction is calculated using the formula: $\Delta_{r}H^{\circ} = \sum \Delta_{f}H^{\circ}(	ext{products}) - \sum \Delta_{f}H^{\circ}(	ext{reactants})$For the reaction: $CCl_{4(g)} + 2H_2O_{(g)} ightarrow CO_{2(g)} + 4HCl_{(g)}$$\Delta_{r}H^{\circ} = [\Delta_{f}H^{\circ}(CO_{2(g)}) + 4 	imes \Delta_{f}H^{\circ}(HCl_{(g)})] - [\Delta_{f}H^{\circ}(CCl_{4(g)}) + 2 	imes \Delta_{f}H^{\circ}(H_2O_{(g)})]$Substituting the given values:$\Delta_{r}H^{\circ} = [-394 + 4 	imes (-92)] - [-105 + 2 	imes (-242)]$$\Delta_{r}H^{\circ} = [-394 - 368] - [-105 - 484]$$\Delta_{r}H^{\circ} = -762 - (-589)$$\Delta_{r}H^{\circ} = -762 + 589 = -173 \ kJ \ mol^{-1}$The magnitude of the enthalpy of the reaction is $173 \ kJ \ mol^{-1}$.

Similar Questions

The standard enthalpies of formation $(\Delta H_f^o)$ for $CO_{2(g)}$,$CO_{(g)}$,and $H_2O_{(g)}$ are $-393.5$,$-110.5$,and $-241.8 \ kJ \ mol^{-1}$ respectively. What is the standard enthalpy change (in $kJ \ mol^{-1}$) for the reaction: $CO_{2(g)} + H_{2(g)} \rightarrow CO_{(g)} + H_2O_{(g)}$?

The absolute enthalpy of neutralisation of the reaction $MgO_{(s)} + 2HCl_{(aq)} \to MgCl_{2(aq)} + H_2O_{(l)}$ will be

At $300 \, K$,the standard enthalpies of formation of $C_6H_5COOH_{(s)}$,$CO_{2_{(g)}}$,and $H_2O_{(l)}$ are $-408$,$-393$,and $-286 \, kJ \, mol^{-1}$ respectively. What is the heat of combustion of benzoic acid at constant volume in $kJ$ (in $.75$)? $(R = 8.31 \, J \, mol^{-1} \, K^{-1})$

Enthalpy change for a reaction does not depend upon

For the reaction $2 H_2 + O_2 \rightarrow 2 H_2 O$,$\Delta H = -571 \ kJ$. Bond energy of $H-H = 435 \ kJ$ and $O=O = 498 \ kJ$. Then the average bond energy of $O-H$ bond will be:

Vedclass Test Series

Exam Paper Generator

Online Exam Module