20 mL of pure water weighs how much?

1 g/mL. Thus, 20 mL of pure water weighs 20 g.

Explanation:

pure water is 1 g/mL. Thus, 20 mL of pure water weighs 20 g.

that is a club

explanation:

i am good at it i think hope its right

answer; ///(b) it is composed of four protein chains and four heme groups;