Question

what volume of ethyl alcohol and water must be mixed together to prepare 250ml of 60%(volume/volume)solution of alcohol in water

Answer 1

Dear student!
60% by volume of alcohol solution means, each 100 ml of solution will have 60 ml ethyl alcohol

So, 250 ml of solution will have = (60 /100) x250 = 150 ml of ethyl alcohol

Hence, In a 250 ml solution of 60% by volume of alcohol and water, alcohol should be 150 ml and water should be 100 ml.