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Thermodynamics question

2023 · Q122
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Thermodynamics question

2023 · Q122

NEETChemistryThermodynamicsMCQ+4 / −1

Consider the following reaction :-

2H2( g)+O2( g)→2H2O(g)ΔrH∘=−483.64 kJ. 2 \mathrm{H}_2(\mathrm{~g})+\mathrm{O}_2(\mathrm{~g}) \rightarrow 2 \mathrm{H}_2 \mathrm{O}(\mathrm{g}) \Delta_{\mathrm{r}} \mathrm{H}^{\circ}=-483.64 \mathrm{~kJ} \text {. }2H2​( g)+O2​( g)→2H2​O(g)Δr​H∘=−483.64 kJ. 

What is the enthalpy change for decomposition of one mole of water? (Choose the right option).

  1. A
    120.9 kJ
  2. B
    241.82 kJ
  3. C
    18 kJ
  4. D
    100 kJ
View written solutionFree

Correct answer: B

Decomposition for 1 mole of water

$$\begin{aligned} & \mathrm{H}_2 \mathrm{O}(\mathrm{g}) \rightarrow \mathrm{H}_2(\mathrm{~g})+\frac{1}{2} \mathrm{O}_2(\mathrm{~g}) ; \Delta \mathrm{H}=+\frac{483.64}{2} \\ & \Delta \mathrm{H}=+241.82 \mathrm{~kJ} \end{aligned}$$

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