# Question #76765

##### 1 Answer

The answer is **A)**.

#### Explanation:

The thing to remember about a solution's *volume by volume percent concentration*, **of solution**.

#color(blue)(ul(color(black)("% v/v" = "volume of solute"/"100 mL of solution" xx 100%)))#

This means that in order for an alcohol solution to have a **for every**

This can be calculated by using the above equation

#40% = V_"alcohol"/"100 mL" xx 100%#

Rearrange to solve for

#V_"alcohol" = (40 color(red)(cancel(color(black)(%))) * color(blue)(cancel(color(black)(100))) "mL")/(color(blue)(cancel(color(black)(100)))color(red)(cancel(color(black)(%)))) = "40 mL"#

Now, don't forget that you need **for every** **of solution**, which implies that the correct answer is **A)**

#"100 mL solution" = "40 mL alcohol" + "60 mL water"#