271. mL of a 21% v/v solution of ethanol,C2H6O , in water

Question

271. mL of a 21% v/v solution of ethanol,C2H6O , in water>

what is the ...........mL of C2H6O

what is the .......... mL of water

Answer 1

21% v/v means 21 mls of ethanol per 100 mls solution

To find mls of ethanol and mls of water, we assume the volumes are additive and...

271 ml soln x 21 ml ethanol/100 ml soln = 56.9 mls ethanol

mls H2O = 271 ml - 56.9 ml = 214.1 ml H2O