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August 31, 2015

Homework Help: Chemistry! Test tomorrow, pls help !

Posted by Alisha on Thursday, October 4, 2012 at 10:03pm.

we're given the equation:

C6H6(l)+Br2(l) --> C6H5Br(l)+HBr(g)

you need to prepare 50.0g pf bromobenzene and you expect no more than a 75% yield. How much benzene should you begin with if the yield is 75%.

i know that % yield = (actual/theoretical) * 100 %

but i dont know how to get the actual/theoretical values. would 50.0 g be put as an actual or theoretical value? The way i understand it, is that it should be used as the actual value because that is the amount you want to prepare, and if its put as a theoretical value the actual amount would always be less than theoretical. Am i thinking right?

This question confuses me, maybe it confuses me because they say 75% twice and it throws me off lol. please explain steps as well, thank you in advance!

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