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simple atom economy - how are all of these wrong?



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!
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 ...
(edited 11 years ago)
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Secret.
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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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