$N_{2} (g) + 3 H_{2} (g) \to 2 {N H}_{3} (g) + 92$ kJ

Ammonia is produced from nitrogen and hydrogen by the exothermic reaction represented above. When $4$ moles of ammonia are produced by the reaction, which of the following is correct?

46 kJ is absorbed

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92 kJ is absorbed

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184 kJ is absorbed

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92 kJ is given off

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184 kJ is given off

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Solution

The correct option is E 184 kJ is given off
$N_{2} (g) + 3 H_{2} (g) \to 2 {N H}_{3} (g) + 92$ kJ
When 2 moles of ammonia are produced by the reaction, 92 kJ is given off.
When 4 moles of ammonia are produced by the reaction, $92 \times 2 = 184$ kJ is given off.

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Q. Carbon dioxide is produced from carbon and oxygen by the exothermic reaction represented below:

C (s) + O_{2} (g) \to C O_{2} (g) + 394 k J

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Q. In the manufacture of ammonia by Haber's process,

N_{2} (g) + 3 H_{2} (g) ⇋ 2 N H_{3} (g) + 92.3

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Q. The enthalpy change for a reaction

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

is -92.2 kJ/mol. Calculate the enthalpy of formation of ammonia.

Given the bond energies $N \equiv N$ , $H - H$ and $N - H$ bonds are $945, 436$ and $391 k J m o l e^{- 1}$ respectively, the enthalpy of the following reaction $N_{2} (g) + 3 H_{2} (g) \to 2 N H_{3} (g)$ is

Q. The reaction of nitrogen with hydrogen to make ammonia has

Δ H = - 92 k J

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N2(g)+3H2(g)→2NH3(g)+92 kJAmmonia is produced from nitrogen and hydrogen by the exothermic reaction represented above. When 4 moles of ammonia are produced by the reaction, which of the following is correct?

The correct option is E 184 kJ is given offN2(g)+3H2(g)→2NH3(g)+92 kJWhen 2 moles of ammonia are produced by the reaction, 92 kJ is given off. When 4 moles of ammonia are produced by the reaction, 92×2=184 kJ is given off.

$N_{2} (g) + 3 H_{2} (g) \to 2 {N H}_{3} (g) + 92$ kJ

Ammonia is produced from nitrogen and hydrogen by the exothermic reaction represented above. When $4$ moles of ammonia are produced by the reaction, which of the following is correct?

The correct option is E 184 kJ is given off
$N_{2} (g) + 3 H_{2} (g) \to 2 {N H}_{3} (g) + 92$ kJ
When 2 moles of ammonia are produced by the reaction, 92 kJ is given off.
When 4 moles of ammonia are produced by the reaction, $92 \times 2 = 184$ kJ is given off.