(B) The chemical reaction is: $2CO(g) + O_2(g) \rightarrow 2CO_2(g)$.The relationship between enthalpy change and internal energy change is given by:

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(B) The chemical reaction is: $2CO(g) + O_2(g) \rightarrow 2CO_2(g)$.The relationship between enthalpy change and internal energy change is given by: $\Delta H = \Delta U + \Delta n_g RT$.Here,$\Delta n_g$ is the change in the number of moles of gaseous products and reactants: $\Delta n_g = n_p - n_r = 2 - (2 + 1) = 2 - 3 = -1$.Since $\Delta n_g = -1$,the equation becomes: $\Delta H = \Delta U - RT$.Therefore,$\Delta H < \Delta U$.

Class 11 Chemistry Thermodynamics First law of thermodynamics

Medium

$A$ mixture of $2 \ mol$ of carbon monoxide and $1 \ mol$ of oxygen is ignited in a closed vessel to form carbon dioxide. If $\Delta H$ is the enthalpy change and $\Delta U$ is the change in internal energy,then:

A
$\Delta H > \Delta U$
B
$\Delta H < \Delta U$
C
$\Delta H = \Delta U$
D
Cannot be determined.

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Thermodynamics

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First law of thermodynamics

One mole of an ideal gas is allowed to expand reversibly and adiabatically from a temperature of $27\,^{\circ}C$. If the work done during the process is $3\, kJ$,then the final temperature of the gas is $...\, K$.

DifficultAIIMS 2010

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Identify from the following reactions the one that exhibits negative work done by the system.

MediumMHT CET 2025

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When one mole of $NH_3$ gas and one mole of $HCl$ gas are mixed in a closed container to form ammonium chloride gas,which of the following is true?

Medium

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At constant $T$ and $P$,which one of the following statements is correct for the reaction,$CO_{(g)} + \frac{1}{2} O_{2(g)} \to CO_{2(g)}$?

MediumAIIMS 1983

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

Medium

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$A$ mixture of $2 \ mol$ of carbon monoxide and $1 \ mol$ of oxygen is ignited in a closed vessel to form carbon dioxide. If $\Delta H$ is the enthalpy change and $\Delta U$ is the change in internal energy,then:

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One mole of an ideal gas is allowed to expand reversibly and adiabatically from a temperature of $27\,^{\circ}C$. If the work done during the process is $3\, kJ$,then the final temperature of the gas is $...\, K$.

Identify from the following reactions the one that exhibits negative work done by the system.

When one mole of $NH_3$ gas and one mole of $HCl$ gas are mixed in a closed container to form ammonium chloride gas,which of the following is true?

At constant $T$ and $P$,which one of the following statements is correct for the reaction,$CO_{(g)} + \frac{1}{2} O_{2(g)} \to CO_{2(g)}$?

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

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