# Question #aadce

##### 1 Answer

#### Explanation:

For starters, you should know that an *for every*

If you take **total volume** of the resulting solution will be

#x color(white)(.)"mL" + "200 mL" = (200 + x)color(white)(.)"mL"#

Since you know that this solution must contain

#100 color(red)(cancel(color(black)("mL solution"))) * (x color(white)(.)"mL methanol")/((200 + x) color(red)(cancel(color(black)("mL solution")))) = "80 mL methanol"#

This will get you

#100 * (xcolor(red)(cancel(color(black)("mL methanol"))))/(200 + x) = 80 color(red)(cancel(color(black)("mL methanol")))#

#100 * x/(200 + x) = 80#

Solve for

#100 * x = 80 * (200 + x)#

#100 * x = 16000 + 80x#

#20x = 16000 implies x= 16000/20 = 800#

You can thus say that if you add

The answer must be rounded to one **significant figure**, the number of sig figs you have for the volume of water.