I'm reviewing AS content and I don't get why sometimes when calculating the actual/theoretical yield you do (100/percentage) instead of (percentage/100) to times by the moles, if that makes sense!
e.g. 'Synthesis of compound D from 1,3-diaminobenzene. 1.73g of compound D prepared. Overall percentage yield of compound D was 40%, Mr of compound D = 346.0, calculate the mass of 1,3 - diaminobenzene needed for this synthesis'
1,3 - diaminobenzene = 108
Compound D mol = 1.73 / 346 = 5 x 10^-3
1,3 - diaminobenzene mol = 5 x 10^-3 x (100/40) = 0.0125
mass = 0.0125 x 108 = 1.35g
thanks in advance, sorry if its straight forward I'm at a blank!
percentage yield help Watch
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