Question
Asked Nov 1, 2019

N2(g) + 3H2(g) → 2NH3(g)ΔH = -92.2 kJ

H2(g) + Cl2(g) → 2HCl(g)ΔH = -184.7 kJ

N2(g) + 4H2(g) + Cl2(g) → 2NH4Cl(s)ΔH = -628.9 kJ

Find the ΔH of the following reaction:

NH3(g) + HCl(g) → NH4Cl(s)
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Expert Answer

Step 1

Hess’s law states that the total enthalpy change of a reaction remains same whether the reaction occurs in one step or in a number of steps.

According to Hess’s law,

  1. The enthalpy change of a reaction becomes half, if its coefficients are divided by 2.
  2. The sign of enthalpy change gets reversed on reversing the chemical reaction.
  3. The enthalpy change of a reaction becomes twice, if its coefficients are multiplied with 2.
Step 2

Reverse the first reaction and divide it by 2.

2ΝΗ, ( g)
>N, (g)+3H, (g
AH 92.2 kJ
92.2
-kJ = 46.1 kJ
2
NH (g)N2(g)+H(g)
ΔΗ-
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Image Transcriptionclose

2ΝΗ, ( g) >N, (g)+3H, (g AH 92.2 kJ 92.2 -kJ = 46.1 kJ 2 NH (g)N2(g)+H(g) ΔΗ-

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Step 3

Reverse the second reaction...

2HC(g) -> Н, (g)+Cl1,(g)
ΔΗ-184.7 kJ
нсце) -н.е)с, е)
184.7
-Н, (g) +—Cl, (g)
kJ 92.4 kJ
2
ΔΗ
help_outline

Image Transcriptionclose

2HC(g) -> Н, (g)+Cl1,(g) ΔΗ-184.7 kJ нсце) -н.е)с, е) 184.7 -Н, (g) +—Cl, (g) kJ 92.4 kJ 2 ΔΗ

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