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Introduction

In which of t...

Question

In which of the following reactions does the heat change represent the heat of formation of water?

2 H_{2 (g)} + O_{2 (g)} \to 2 H_{2} O_{(l)}; Δ H = 116 K c a l

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H_{2 (g)} + \frac{1}{2} O_{2 (g)} \to H_{2} O_{(l)}; Δ H = - 6.8 K c a l

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H_{(a q)}^{+} + O H_{(a q)}^{-} \to H_{2} O_{(l)}; Δ H = 13.7 K c a l

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C_{2} H_{2 (g)} + 2 O_{2 (g)} \to 2 C O_{2 (g)} + H_{2} O_{(l)}; Δ H = 310 K c a l

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Solution

The correct option is B $H_{2 (g)} + \frac{1}{2} O_{2 (g)} \to H_{2} O_{(l)}; Δ H = - 6.8 K c a l$
For the heat of formation one mole of product is formed from its constituent elements in their standard state formation of $H_{2} O (l)$
$H_{2} (g) + \frac{1}{2} O_{2} (g) \to H_{2} O (l)$

Option B is correct.

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Similar questions

H^{+} (a q) + O H^{-} (a q) = H_{2} O (l); Δ H = - X_{1} k J . m o l^{- 1}

H_{2} (g) + \frac{1}{2} O_{2} (g) = H_{2} O (l); Δ H = - X_{2} k J . m o l^{- 1}

C O_{2} (g) + H_{2} (g) = C O (g) + H_{2} O (l); Δ H = + X_{3} k J . m o l^{- 1}

C_{2} H_{2} (g) + \frac{5}{2} O_{2} (g) = 2 C O (g) + H_{2} O (l); Δ H = + X_{4} k J . m o l^{- 1}

H_{2} O (l)

2 C (s) + 2 O_{2} (g) \to 2 C O_{2} (g), Δ H = - 787 k J

H_{2} (g) + \frac{1}{2} O_{2} (g) \to H_{2} O (l), Δ H = - 286 k J

C_{2} H_{2} (g) + \frac{5}{2} O_{2} (g) \to 2 C O_{2} (g) + H_{2} O (l), Δ H = - 1310 k J

K (s) + H_{2} O (l) + (a q) ⟶ K O H (a q) + \frac{1}{2} H_{2} (g); Δ H = - 48.0 k c a l

H_{2} (g) + \frac{1}{2} O_{2} (g) ⟶ H_{2} O (l); Δ H = - 68.4 k c a l

K O H (s) + (a q) ⟶ K O H (a q); Δ H = - 14.0 k c a l

(i) H^{+} (a q) + O H^{-} (a q) \to H_{2} O (l), Δ H = - X_{1} {kJ mol}^{- 1}

(i i) H_{2} (g) + \frac{1}{2} O_{2} (a q) \to H_{2} O (l), Δ H = - X_{2} {kJ mol}^{- 1}

(i i i) C O_{2} (g) + H_{2} (g) \to C O (g) + H_{2} O (l), Δ H = - X_{3} {kJ mol}^{- 1}

(i v) C_{2} H_{2} (g) + \frac{5}{2} O_{2} (g) \to 2 C O_{2} (g) + H_{2} O (l), Δ H = X_{4} {kJ mol}^{- 1}

H_{2} O (l)

C (S) + O_{2} (g) \to C O_{2} (g)

Δ H = - 94.0 K c a l

H_{2} (g) + \frac{1}{2} O_{2} (g) \to H_{2} O (l)

Δ H = - 68.0 K c a l

C H_{3} C O O H (l) + 2 O_{2} (g) \to 2 C O_{2} (g) + 2 H_{2} O (l)

Δ H = - 210.0 K c a l

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