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Enthalpy

Refer to the ...

Question

Refer to the following potential energy diagram and the choices above
What is the $△ H$ of the reaction to form $C O_{2}$ from $C + O_{2}$ ?

- 94.0 k c a l

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- 26.4 k c a l

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- 67.6 k c a l

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C (s) + \frac{1}{2} O_{2} (g)

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C O_{2} (g)

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Solution

The correct option is A $- 94.0 k c a l$
As shown in above diagram △H of the reaction $=$ $- 26.4 - 67.6$ $=$ $- 94 k c a l$

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Similar questions

△ H

C O

C + O_{2}

C (s) + O_{2} (g) \to C O_{2} (g), Δ H = + 94.0 K c a l .

C O (g) + \frac{1}{2} O_{2} (g) \to C O_{2} (g), Δ H = - 67.7 K c a l .

^{- 1}

C (s) + \frac{1}{2} O_{2} (g) \to C O (g)

△ H

C O_{2}

C O + O_{2}

C (s) + \frac{1}{2} O_{2} (g) \to C O (g); Δ H_{1} = a

C O (g) + \frac{1}{2} O_{2} (g) \to C O_{2} (g); Δ H_{2} = b

C (s) + C O_{2} (g) \to 2 C O (g); Δ H_{3} = c

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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