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Percentage Yeild

Hi, can't figure out this question:

5.0 g of methylbenzene (mr = 92) was mixed with excess concentrated nitric and sulphuric acid to produce 4.7 g of 2-methylnitrobenzene (mr = 137).

a)What was the percentage yield?
*
b)What mass of methylbenzene would be required to give 10.0 g of 2-methylnitrobenzene, given the same percentage yield?

I know the answers are
a)63.1%
b) 10.6 g

but I don't know how on earth to work them out? =/
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Avatar for Borek
Borek
4
Writing reaction equation should be the first step.

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