Find the molecular formula of the alkene, 7 g of which is added with 16 g of bromine.

univerkov | December 10, 2020 | education

n (Br2) = 16/160 = 0.1 mol
alkene adds only 1 equivalent of bromine, therefore the amount of bromine substance is equal to the amount of alkene
M (alkene) = 7 / 0.1 = 70 g / mol
alkenes formula: СnH2n
12n + 2n = 70
n = 5
molecular formula C5H10

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