Jean in Newcastle Posted November 1, 2012 Share Posted November 1, 2012 This is what he e-mailed me after chemistry today: I understand how to do it, i.e. 1 Mole 5 kg --------- + ---------- 2 kg 5 Moles You can cross out the kilograms and the moles. What I don't see is why. In this problem, the second part has a different denominator from the first. I thought you could only cross things out if they had the same denominator or were in a multiplication problem. *sorry for the formatting of the problem. It looks fine in preview but it must reformat it or something to take out the spaces I put in to align it correctly. Quote Link to comment Share on other sites More sharing options...
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