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7 October, 07:36

Alkane is obtained from the catalytic hydrogenation of both alkene A and alkene B. The heat of hydrogenation of alkene A is 29.8 kcal/mol, and the heat of hydrogenation of alkene B is 31.4 kcal/mol.

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  1. 7 October, 07:54
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    Alkene A is more stable than alkene B

    Explanation:

    Complete question:

    The same alkane is obtained from the catalytic hydrogenation of both alkene A and alkene B. The heat of hydrogenation of alkene A is 29.8 kcal/mol, and the heat of hydrogenation of alkene B is 31.4 kcal/mol. Which alkene is more stable?

    Step 1: Data given

    The heat of hydrogenation of alkene A is 29.8 kcal/mol

    The heat of hydrogenation of alkene B is 31.4 kcal/mol

    Step 2: Which alkene is more stable

    The smaller the heat of hydrogenation, the more stable the alkene. This because it releases less heat, and has less energy.

    29.8 < 31.4

    This means alkene A has a smaller heat of hydrogenation than alkene B

    Alkene A is more stable than alkene B
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