Which of the following equations represents a reaction that provides the heat of formation of ethane $(C H_{3} C H_{3})$ ?

2 C (s) + 6 H (g) \to C H_{3} C H_{3} (g)

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2 C (s) + 3 H_{2} (g) \to C H_{3} C H_{3} (g)

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C H_{2} = C H_{2} (g) + 2 H_{2} (g) \to C H_{3} C H_{3} (g)

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

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Solution

The correct option is B $2 C (s) + 3 H_{2} (g) \to C H_{3} C H_{3} (g)$
The amount of heat absorbed or evolved when 1 mole of the substance is directly obtained from its constituent elements in their standard state is called heat of formation.

The heat of formation of ethane :

$2 C (s) + 3 H_{2} (g) \to C H_{3} C H_{3} (g)$

Hence, option B is correct.

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Similar questions

Complete the given thermal cracking reaction:

$C H_{3} C H_{2} C H_{3} (g) \to$

C H_{2} = C H_{2} (g) + H_{2} (g) \to C H_{3} C H_{3} (g)

$C H_{3} C H_{2} C H_{2} C H_{3} (g) \to C H_{3} C H_{3} (g) + P$

The given reaction is a thermal cracking reaction. Identify P.

C_{2} H_{4}

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

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

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

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

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