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http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w13_qp_11.pdf A
Number 26 Answer is B but why not 4??
w13qp11
4 atoms of H are removed (from 3 COOH and 1 OH).
4H --> 2H2 ( 2 moles of H2 gases)