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    • Thread Starter

    Hi all ,
    This is a really stupid question but it's a trap I always fall into .I need to be sure.

    Let's say I have the following reaction ;

    2A + 3B -->> C + D and the mass of A is 10g.To work out number of moles I know I'll use n=m/Mr
    For the Mr I don't multiply the co-efficient and all the individual masses of the elements in A right?

    Posted from TSR Mobile

    If you have 10 g of A, it doesn't matter what you react it with, the number of particles will be the same, hence the number of moles of A you have is unaffected.

    So, you're correct.

    Nope, if A is an element, just the mass number and if a compound, add the mass numbers together. No multiplying to be done.
    2 moles would be the theoretical amount, you're calculating the actual number of moles.
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