Question

standard molar enthalpy of formation of which of the following substances is zero at 298K and why?
a. C (diamond)
b. C (g)
c. Br2 (g)
d. Cl2
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Answer 1

Answer:

d.. Cl2..

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Answer 2

Answer:

(d) $CI_{2} (g)$

Explanation:

because Methylene is an organic compound with the chemical formula CH ₂. It is a colourless gas that fluoresces in the mid-infrared range, and only persists in dilution, or as an adduct. Methylene is the simplest carbene.