Which of the following have standard heat of formation zero?

O

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C d

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C_{(g r a p h i t e)}

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H g

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Solution

The correct option is C $C_{(g r a p h i t e)}$
As the standard state of carbon is $C_{g r a p h i t e}$ so, the standard heat of formation is zero.

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C_{g r a p h i t e}, P_{B l a c k}, S_{m o n o c l i n i c}, I_{2} (s o l i d)

k J / m o l

25^{o} C

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25^{o} C

{F e}_{2} O_{3} (s) + 3 C_{g r a p h i t e} ⟶ 2 F e (s) + 3 C O (g); Δ H^{o} = 492 k J / m o l

F e O (s) + C_{g r a p h i t e} ⟶ F e (s) + C O (g); Δ H^{o} = 155.8 k J / m o l

C_{g r a p h i t e} + O_{2} (g) ⟶ C O_{2} (g); Δ H^{o} = - 393.51 k J / m o l

C O (g) + \frac{1}{2} O_{2} (g) ⟶ C O_{2} (g); Δ H^{o} = - 282.98 k J / m o l

F e O (s)

{F e}_{2} O_{3} (s)

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