(A) The reaction for the formation of one mole of water from gaseous atoms is: $2H_{(g)} + O_{(g)} \longrightarrow H_2O_{(g)}$.In one mole of $H_2O$,t

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Emission of $218 \ kcal$ of energy

(A) The reaction for the formation of one mole of water from gaseous atoms is: $2H_{(g)} + O_{(g)} \longrightarrow H_2O_{(g)}$.In one mole of $H_2O$,there are two $O-H$ bonds.The energy released during the formation of two $O-H$ bonds is equal to $2 \times \Delta H_{O-H}$.Given $\Delta H_{O-H} = 109 \ kcal \ mol^{-1}$.Therefore,energy released $= 2 \times 109 = 218 \ kcal \ mol^{-1}$.Since energy is released,the enthalpy change is $\Delta H = -218 \ kcal \ mol^{-1}$.

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

Medium

If the value of $\Delta H_{O-H}$ is $109 \ kcal \ mol^{-1}$,then the formation of one mole of water from $H_{(g)}$ and $O_{(g)}$ is associated with:

A
Emission of $218 \ kcal$ of energy
B
Emission of $109 \ kcal$ of energy
C
Absorption of $278 \ kcal$ of energy
D
Cannot be predicted

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Thermodynamics

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Heat of reaction, Bond energy and Hess law

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If the value of $\Delta H_{O-H}$ is $109 \ kcal \ mol^{-1}$,then the formation of one mole of water from $H_{(g)}$ and $O_{(g)}$ is associated with:

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Bond enthalpies of $A_{2}$,$B_{2}$ and $AB$ are in the ratio $2:1:2$. If the enthalpy of formation of $AB$ is $-100 \ kJ \ mol^{-1}$,the bond enthalpy of $B_{2}$ is:

The enthalpy of reaction for the reaction: $2 H_{2(g)} + O_{2(g)} \to 2 H_{2}O_{(l)}$ is $\Delta_{r}H^{\theta} = -572 \ kJ \ mol^{-1}$. What will be the standard enthalpy of formation of $H_{2}O_{(l)}$?

For the reaction,$H_{2(g)} + I_{2(g)} \to 2HI_{(g)}$,$\Delta H = -12.40 \ kcal$. According to this,the heat of formation of $HI$ will be......$kcal$.

Average bond enthalpy of water is $464.5 \text{ kJ mol}^{-1}$. If the energy required to break the first $O-H$ bond is $502 \text{ kJ mol}^{-1}$,how much energy per mol is required to break the second $O-H$ bond?

Given that the molar combustion enthalpies of benzene,cyclohexane,and hydrogen are $x, y$,and $z$ respectively,the molar enthalpy of hydrogenation of benzene to cyclohexane is

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