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3 April, 06:27

How many moles of hydrogen are evolved when an excess of sodium metal is added to one mole of citric acid?

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  1. 3 April, 09:23
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    The formula of citric acid is:

    CO2H

    |

    HO - C - CH2CO2H

    |

    C - CH2 CO2H

    I bolded the 4 hydrogens that can be subsituted by sodium.

    Three of those hydrogens belong to carboxyl group ( - CO2H) and one to a hydroxyl group ( - OH).

    You need to take into account that 4 H will form 2 H2 molecules.

    So, the answer is that 2 moles of molecules will be formed from 1 mole of citric acid molecules.
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