NEET 2023, Chemistry Q37: Basic Concepts of Thermodynamic

NEET2023Chemistry

Which amongst the following options is the correct relation between change in enthalpy and change in internal energy?

A
$Δ H = Δ U + Δ n_{g} R T$
B
$Δ H - Δ U = - Δ n R T$
C
$Δ H + Δ U = Δ n R$
D
$Δ H = Δ U - Δ n_{g} R T$

Solution

By definition $H = U + P V$ . For an ideal gas at constant temperature, $P V = n R T$ , so the change is $Δ (P V) = Δ n_{g} R T$ where $Δ n_{g}$ is the change in moles of gas.

Therefore $Δ H = Δ U + Δ n_{g} R T$ .

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NEET 2023, Chemistry Q37: Basic Concepts of Thermodynamic

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