Which option is a solution that is 20% (v/v) methanol in water?

1. The solution contains 20 mL of methanol and 100 mL of water.

2. The solution contains 20 mL of methanol and 80 mL of water.

3. The solution contains 20 g of methanol and 100 mL of water.

4. The solution contains 20 g of methanol and 80 mL of water.

20 % volume/volume methanol in water contains 20 mL of methanol and 80 mL of water.

Explanation:

Total volume of the solution = 20 + 80 = 100 mL