Question

A 250-gram solution of alcohol contains 180 mL of water. What is the mass percent of alcohol? (Remember water's density.)

Answer 1

1 mL of water is 1 gram.

the mass percent of alcohol: (250-180) / 250 = 28%

Step-by-step explanation:

Answer 2

1 mL of water is 1 gram.

So, the mass percent of alcohol is the rest: (250-180) / 250 = 28%