Consider the following reaction: What is the enthalpy change for decomposition of one mole of water? (Choose the right option.) [2023]

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Solution

Q.
Consider the following reaction:

$2 H_{2 (g)} + O_{2 (g)} \to 2 H_{2} O_{(g)}; Δ_{r} H ° = - 483.64$ $kJ$

What is the enthalpy change for decomposition of one mole of water (Choose the right option.) [2023]

1 120.9 kJ

2 241.82 kJ

3 18 k]

4 100 kJ

Ans.
(2)

Decomposition for 1 mole of water,

$H_{2} O_{(g)} \to H_{2 (g)} + \frac{1}{2} O_{2 (g)}; ∆ H = + \frac{483.64 kJ}{2}$

$Δ H = + 241.82$ $kJ$ ${mol}^{- 1}$

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