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(9701) Chemistry Paper 5 Planning and analysis help

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    Hi guys, here is a question ( question 2) http://papers.xtremepapers.com/CIE/C...1_s08_qp_5.pdf i have been trying to solve the entire day. It is about determining x in hydrous salt. Now what i did was plot mass of basic carbonate (y axis) against number of moles of carbonate (i.e (mass of CuO/(2 x 79.5)) I wrote this considering the molar ratio of CuO and basic carbonate. And so the gradient of graph would give mass/mol= Mr of hydrous salt.

    So i did this but the mark scheme ( http://papers.xtremepapers.com/CIE/C...1_s08_ms_5.pdf ) says ignore any ref to moles. So idk, even if i plot mass of CuO against basic carbonate mass or reverse or in anyway as shown in the mark scheme as shown below, how do i calculate the value of x? can somebody please help me, while considering any of the option out of those given like how can we plot the graph/

    Please help asap
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