For which of the following - H is not equal to - U A- 2 HI g - H 2 g - I 2 g B- 2 SO 2 g - O 2 g - 2 SO 3 g C- N 2 g -3 H 2 g - 2 NH 3 g D- 2 NO 2 g - N 2 O 4 g

The correct options are B 2 SO_2(g)+O_2 (g)→ nbsp; 2SO_3 (g) C N_2(g)+3H_2 (g)→ nbsp; 2NH_3 (g) D 2NO_2(g)+→ nbsp; N_2O_4 (g)We know, Δ H = Δ U+ Δ n_gRT S ...

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Byju's Answer

Standard XII

Chemistry

Difference between Internal Energy and Enthalpy

For which of ...

Question

For which of the following $Δ H$ is not equal to $Δ U$

2 H I (g) \to H_{2} (g) + I_{2} (g)

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2 S O_{2} (g) + O_{2} (g) \to 2 S O_{3} (g)

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N_{2} (g) + 3 H_{2} (g) \to 2 N H_{3} (g)

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2 N O_{2} (g) + \to N_{2} O_{4} (g)

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Solution

The correct options are
B $2 S O_{2} (g) + O_{2} (g) \to 2 S O_{3} (g)$
C $N_{2} (g) + 3 H_{2} (g) \to 2 N H_{3} (g)$
D $2 N O_{2} (g) + \to N_{2} O_{4} (g)$
We know,
$Δ H = Δ U + Δ n_{g} R T$
So when, $Δ n_{g} = (n_{p} - n_{r})_{g} = 0$ $\Rightarrow Δ H$ becomes equal to $Δ U$ .
for (a)
$Δ n_{g} = (n_{p} - n_{r})_{g} = 0$

for (b)
$Δ n_{g} = (n_{p} - n_{r})_{g} = - 2$

for (c)
$Δ n_{g} = (n_{p} - n_{r})_{g} = - 2$

for (d)
$Δ n_{g} = (n_{p} - n_{r})_{g} = - 1$

We can clearly see for (b), (c), (d)
$Δ n_{g} = (n_{p} - n_{r})_{g} i s n o t e q u a l t o 0$
so, for these cases,
$Δ H$ is not equal to $Δ U$ .

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For which of the following ΔH is not equal to ΔU

For which of the following $Δ H$ is not equal to $Δ U$