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QUESTION
What mass of ethane is contained 50 ml of 13.9% by mass solution of ethane in hexane? density of solution is .611 g/ml.
4.2g
##M_("eth")/M_("soln")xx100=13.9##
So:
##M_("eth")=(13.9xxM_("soln"))/(100)##
##M_("soln")="density"xx"volume"=0.611xx50=30.55"g"##
So:
##M_("eth")=(13.9xx30.55)/(100)=4.2"g"##
