In which of the following reactions - H is equal to - U - A- C 3 H 8 g -5 O 2 g - 3 CO 2 g -4 H 2 O 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- CH 4 g -2 O 2 g - CO 2 g -2 H 2 O g

The correct option is D CH_4 (g)+ 2O_2 (g) → CO_2(g) +2H_2O(g)We know, Δ H = Δ U+ Δ n_gRT when Δ n_g=0. Then, nbsp;Δ H = Δ U for (a) so, nbsp; Δ n_g=7 6 ...

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Byju's Answer

Standard XII

Chemistry

Enthalpy

In which of t...

Question

In which of the following reactions $Δ H$ is equal to $Δ U$ ?

C_{3} H_{8} (g) + 5 O_{2} (g) \to 3 C O_{2} (g) + 4 H_{2} O (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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C H_{4} (g) + 2 O_{2} (g) \to C O_{2} (g) + 2 H_{2} O (g)

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Solution

The correct option is D $C H_{4} (g) + 2 O_{2} (g) \to C O_{2} (g) + 2 H_{2} O (g)$
We know,
$Δ H = Δ U + Δ n_{g} R T$

when $Δ n_{g} = 0$ . Then, $Δ H = Δ U$

for (a)

so, $Δ n_{g} = 7 - 6 = 1$ . So, $Δ H$ is not equal to $Δ U$

for (b)

$\Rightarrow Δ n_{g} = 2 - 3 = - 1$ .

for (c)

$\Rightarrow Δ n_{g} = 2 - 4 = - 2$ .

For (d),

$Δ n_{g} = 0$ . Then, $Δ H = Δ U$

Clearly, (d) is correct.

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Similar questions

Q. For which of the following

Δ H

is not equal to

Δ U

Q. The reaction in which

△ H > △ U

Which of the following reactions is not correct according to the law of conservation of mass ?

(a) $2 M g (s) + O_{2} (g) \to 2 M g O (s)$

(b) $C_{3} H_{8} (g) + O_{2} (g) \to C O_{2} (g) + H_{2} O (g)$

(d) $C H_{4} (g) + 2 O_{2} (g) \to C O_{2} (g) + 2 H_{2} O (g)$

Q. For the following two reactions:
(i)

C H_{4} (g) + 2 O_{2} (g) \to C O_{2} (g) + 2 H_{2} O (g); Δ H = - 890.4 k J

(ii)

2 H g O (s) \to 2 H g (l) + O_{2} (g); Δ H = + 181.6 k J

Which one of the following statements is correct?

Which of the reaction defines $Δ H_{f}^{0}$ ?

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In which of the following reactions ΔH is equal to ΔU?

The correct option is D CH4(g)+2O2(g)→CO2(g)+2H2O(g)We know, ΔH=ΔU+ΔngRT when Δng=0. Then, ΔH=ΔU for (a) so, Δng=7−6=1. So, ΔH is not equal to ΔU for (b) ⇒Δng=2−3=−1. for (c) ⇒Δng=2−4=−2. For (d), Δng=0. Then, ΔH=ΔU Clearly, (d) is correct.

In which of the following reactions $Δ H$ is equal to $Δ U$ ?