PLZ HELP college chem

08.01 hope this and can i get brainlist? ?

Adialysis unit requires 78.5 l of water.the estimated digit is 5. 

Remember that rust prevented by placing a sacrificial electrode in electrical contact with the iron. the sacrificial electrode must be composed of a metal that  oxidizes  more easily than iron (that is, it must be below iron in table 18.1).

3is your answer to yuor question