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    Question-Alkenes react with hydrogen gas in the presence of a nickel catalyst.
    0.2 mol of an alkene reacted completely with 19.2 dm3 of hydrogen gas at room
    temperature and pressure.
    How many carbon carbon double bonds are there in a molecule of this alkene?
    [The molar volume of a gas is 24.0 dm3 mol–1 at room temperature and pressure]

    How do I solve this???
    •  Official Rep

     Official Rep
    Sorry you've not had any responses about this. Are you sure you've posted in the right place? Here's a link to our subject forum which should help get you more responses if you post there.

    Wow, this one is difficult O_o C2H4 + H2 --> C2H6 So the one double bond in a mole of C2H4 is broken by one mole of hydrogen gas One mole of any gas at room temp and pressure is 24dm3 So 1 mol alkene with n c=c bonds reacts with n * 24dm3 of hydrogen gas 0.2mol * 24dm3 * N = 19.2dm3 x 1 so N = 19.2 * 1 / (24*0.2) = 4 So there is 4 c=c bonds in this alkene.

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