Question

An alcohol solution was prepared by mixing

70
m
L
of alcohol and
100
m
L
of water. Assuming that volumes are additive, what is the percentage by volume of alcohol in the solution?
A. 41% alcohol by volume
B: 44% alcohol by volume
C: 40% alcohol by volume
D: 42% alcohol by volume
Science Subject grade 7

Answer 1

A. 41% alcohol by volume

Explanation:

the amount of alcohol poured in was 70 mL

the total volume is the additive of the two substances you poured: 70+100=170

percent= (amount of substance) / (total volume)

percent = 70/170

70/170= 0.4117

about 41%