Question

Homework examples

1) An experiment requires a solution that is 80% methyl alcohol
by volume. What volume of methyl alcohol should be added to
200 mL of water to make this solution?

Answer 1

800 mL

Explanation:

Let's say we add
`x` mL of methyl alcohol to the water.

Then the proportion of methyl alcohol in the solution would be
`(x)/(200+x)`.

So we have

`(x)/(x+200)=0.8\\\\x=0.8x+160\\\\0.2x=160\\\\x=800`