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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20-05-2017
Chemistry

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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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Edufirst Edufirst · Answer 1 · 2017-05-28T17:36:44+02:00

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.