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    for a) I did: (55.8x2) / 243.6 x100 = 45.8%, however the mark scheme says 51.7%

    for b) 204.4 / (428.4) x 100 = 46.6%, mark scheme says 17%

    these questions are of the alevelchemistry website and so I don't think they all are wrong, but I'm not sure where I've made a mistake, thanks!
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    (Original post by Secret.)


    for a) I did: (55.8x2) / 243.6 x100 = 45.8%, however the mark scheme says 51.7%

    for b) 204.4 / (428.4) x 100 = 46.6%, mark scheme says 17%

    these questions are of the alevelchemistry website and so I don't think they all are wrong, but I'm not sure where I've made a mistake, thanks!
    for (b) the mass of titanium is 47.9, not 204.4 !!!!

    You have used the mass of thalium ...
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    (Original post by charco)
    for (b) the mass of titanium is 47.9, not 204.4 !!!!

    You have used the mass of thalium ...

    Aah damn! Thanks! What about a)?
 
 
 
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