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24 October, 10:28

When benzene (c6h6) reacts with bromine (br2) bromobenzene (c6h5br) is obtained: c6h6 + br2 → c6h5br + hbr what is the theoretical yield of bromobenzene in this reaction when 30.0g of benzene reacts with 65.0 g of bromine?

b. if the actual yield of bromobenzene was 56.7 g what was the percentage yield?

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  1. 24 October, 13:11
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    Answer A) : We have to calculate the number of moles of Benzene involved in the reaction,

    30 g / 78 moles of benzene = 0.384 moles

    For bromine it will be the same process,

    65 g / 159.8 moles = 0.406 moles

    By observing the reaction given above we can say that the reaction ratio of bromine and benzene is 1 : 1

    We need to find the mass of bromobenzene,

    which should be, 6 (12) + 5 (1) + 79.90 = 156.9 g/mol

    So, the mass of bromobenzene will be 156.9 g/mol X 0.3846 mol = 60.343 g

    Hence the theoretical yield will be 60.34 g

    Answer B) : To calculate the actual yield we have to divide it with theoretical yield.

    (56.7g / 60.343 g) X100% = 93.96 %

    Here, we can say that we got 93.96 % of actual yield.

    As we know it is impossible to get 100% yield in any reaction.
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