(A) The reaction is: $H-H + O=O \rightarrow H-O-O-H$. The enthalpy change is calculated as: $\Delta_{r}H = \sum (B.E.)_{\text{reactants}} - \sum (B.E.

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(A) The reaction is: $H-H + O=O \rightarrow H-O-O-H$. The enthalpy change is calculated as: $\Delta_{r}H = \sum (B.E.)_{\text{reactants}} - \sum (B.E.)_{\text{products}}$. $\Delta_{r}H = [BE_{H-H} + BE_{O=O}] - [BE_{O-O} + 2 \times BE_{O-H}]$. $\Delta_{r}H = [436 + 499] - [142 + 2 \times 460]$. $\Delta_{r}H = 935 - [142 + 920]$. $\Delta_{r}H = 935 - 1062 = -127 \ kJ$.

Class 11 Chemistry Thermodynamics Heat of reaction, Bond energy and Hess law

Easy

Calculate $\Delta H$ for the reaction: $H_{2(g)} + O_{2(g)} \rightarrow H_2O_{2(g)}$ given the bond energies: $BE_{H-H} = 436 \ kJ/mol$,$BE_{O=O} = 499 \ kJ/mol$,$BE_{O-O} = 142 \ kJ/mol$,and $BE_{O-H} = 460 \ kJ/mol$. (in $kJ$)

A
$-127$
B
$-209$
C
$-484$
D
$-841$

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Class 11

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Thermodynamics

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Heat of reaction, Bond energy and Hess law

If the heat of formation of $CO_2$ is $-393 \ kJ/mol$,the amount of heat evolved in the formation of $0.156 \ kg$ of $CO_2$ is.....$kJ$.

Medium

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For which of the following reactions does the heat of reaction represent the bond energy of $HCl$?

Easy

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For which one of the following equations is $\Delta H_{react}^o$ equal to $\Delta H_f^o$ for the product?

MediumAIPMT 2003

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The heat of combustion of methane is $-809 \, kJ \, mol^{-1}$. What is the calorific value of methane in $kJ \, g^{-1}$?

Medium

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The enthalpy of atomization of $PH_3(g)$ is $228 \, kcal \, mol^{-1}$ and that of $P_2H_4(g)$ is $355 \, kcal \, mol^{-1}$. The $P-P$ bond energy (in $kcal \, mol^{-1}$) is:

Medium

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Calculate $\Delta H$ for the reaction: $H_{2(g)} + O_{2(g)} \rightarrow H_2O_{2(g)}$ given the bond energies: $BE_{H-H} = 436 \ kJ/mol$,$BE_{O=O} = 499 \ kJ/mol$,$BE_{O-O} = 142 \ kJ/mol$,and $BE_{O-H} = 460 \ kJ/mol$. (in $kJ$)

Similar Questions

If the heat of formation of $CO_2$ is $-393 \ kJ/mol$,the amount of heat evolved in the formation of $0.156 \ kg$ of $CO_2$ is.....$kJ$.

For which of the following reactions does the heat of reaction represent the bond energy of $HCl$?

For which one of the following equations is $\Delta H_{react}^o$ equal to $\Delta H_f^o$ for the product?

The heat of combustion of methane is $-809 \, kJ \, mol^{-1}$. What is the calorific value of methane in $kJ \, g^{-1}$?

The enthalpy of atomization of $PH_3(g)$ is $228 \, kcal \, mol^{-1}$ and that of $P_2H_4(g)$ is $355 \, kcal \, mol^{-1}$. The $P-P$ bond energy (in $kcal \, mol^{-1}$) is:

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