Question

How much of other chemicals must be evaporated from 400 grams of a hand sanitizer that is 24% alcohol to strengthen it to a hand sanitizer that is 30% alcohol? Correct your answer to the nearest whole number.

Answer: grams

Answer 1

400*0.24=96 - grams of alcohol

for 30%:

0.3(400-x)=96

400-x=320

x=80 grams