Consider the following reactions-a H-aq-OH-aq-H2Ol- - H-X1 kJ mol-1b H2g-1-2O2g-H2Ol- - H-X2 kJ mol-1c CO2g-H2g-COg-H2Ol-X3 kJ mol-1d C2H2g-5-2O2g-2CO2g-H2Ol-X4 kJ mol-1Enthalpy of formation of H2Ol is-

The correct option is B X_2 kJ mol^ 1 (a) H^+ + OH^ → H_2O (l) Δ H = X_1 kJ mol^ 1 (b) H_2 + 12 O_2 → H_2O(l) Δ H = X_2 kJ ...

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Heat of Formation

Consider the ...

Question

Consider the following reactions.

(a) $H_{(a q)}^{+} + O H_{(a q)}^{-} = H_{2} O_{(l)}, Δ H = - X_{1}$ kJ $m o l^{- 1}$
(b) $H_{2 (g)} + \frac{1}{2} O_{2 (g)} = H_{2} O_{(l)}, Δ H = X_{2}$ kJ $m o l^{- 1}$
(c) $C O_{2 (g)} + H_{2 (g)} = C O_{(g)} + H_{2} O_{(l)} - X_{3}$ kJ $m o l^{- 1}$
(d) $C_{2} H_{2 (g)} + \frac{5}{2} O_{2 (g)} = 2 C O_{2 (g)} + H_{2} O_{(l)} + X_{4}$ kJ $m o l^{- 1}$

Enthalpy of formation of $H_{2} O_{(l)}$ is:

+ X_{1}

m o l^{- 1}

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- X_{2}

m o l^{- 1}

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+ X_{3}

m o l^{- 1}

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- X_{4}

m o l^{- 1}

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Solution

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Similar questions

C H_{3} O H (l)

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

Δ H^{o} = - 726

m o l^{- 1}

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

Δ_{c} H^{0} = - 393

m o l^{- 1}

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

Δ_{t} H^{o} = - 286

m o l^{- 1}

Δ_{f} H^{o}

C O_{2} (g), C O (g)

H_{2} O (l)

k J m o l^{- 1}

k J m o l^{- 1}

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

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

Δ H = - 787

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

Δ

= - 286

C_{2} H_{2} (g) + \frac{5}{2} O_{2} (g) \to 2 C O_{2} (g) + H_{2} O (l)

Δ

= - 1310

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)

(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)

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