A 250 cm^3 of gaseous mixture of ethane and ethene was reacted with bromine at S.T.P . If 1.34g of bromine was used , determine the percentage of ethene in the mixture .

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A 250 cm^3 of gaseous mixture of ethane and ethene was reacted with bromine at S.T.P . If 1.34g of bromine was used , determine the percentage of ethene in the mixture .

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