Question

The volume of a 20 % (v/v) aqueous solution of ethanol is 80 mL. Calculate the volume of ethanol present in this solution.
a. 40 mL b. 20 mL
c. 16 mL d. 4 mL

If l get the correct answer with a clear explanation, l will mark you as Brainliest

Answer 1

Answer:

Correct answer is

(A) 40 mL

Answer 2

Given: Given that the volume of a 20 % (v/v) aqueous solution of ethanol is 80 mL.

To find: We have to find the volume of ethanol present in this solution.

Solution:

The volume of a 20 % (v/v) aqueous solution of ethanol is 80 mL.

So, in the solution contain 20% ethanol and 80% water.

To determine the volume of ethanol present in this solution we have to determine 20% of 80.

Thus the volume of ethanol present in the solution is

$80 \times 20\% \\ 80 \times \frac{20}{100} \\ = 16$

The correct option is c. 16mL.