labsendreen labsendreen

31-08-2016
Chemistry

Answered

Maki uses 20 gallons of a solution with an unknown ethanol concentration and 60 gallons of a 12% ethanol solution to make 80 gallons of a 10% solution. What is the value of x, the concentration of the unknown ethanol solution?.

A0.02.
B0.04.
C0.05.
D0.08

Verified Answer :

HomertheGenius HomertheGenius

09-09-2016

The equation is:
x 20 + 0.12 60 = 0.10 * 80
20 x + 7.2 = 8
20 x = 8 - 7.2
20 x = 0.8
x = 0.8 : 20 = 0.04 ( or 4% )
Answer: B ) 0.04

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christieholic2017 christieholic2017

18-02-2019

the correct answer is B

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