Question 1204728
i believe your answer will be selection D (2000 ml of 5% alcohol.


here's how i analyzed it.


you have 143 ml of 70% alcohol.
this gives you .7 * 143 = 100.1 ml of alcohol.


you add 143 ml of the solution plus 1857 ml of ewater to get a total solution of 2000 ml.


of this total solution of 2000 ml, 100.1 ml is alcohol.
the ratio of alcohol to total solution is equal to 100.1 / 2000 = .05005.
multiply this by 100 to get 5.005%.
round this to the nearest percent to get 5%.


that's why i picked selection D.