What is the percent of composition by mass of hydrogen in nh4hco3 (gram-formualmass=79 grams/mole)?

It idk haha what are we doing?

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).

Hello there,it will only be somewhat eroded (25%)hope this : ))~top