What percent of magnesium bromide, mgbr2, is magnesium?

How do i complete this electrolysis of water lab? i’m at home, so i don’t have the materials, and the lab didn’t properly work and was incomplete at school.

In which of the following phases of matter do molecules have the highest amount of energy? a. liquid b. gel c. solid d. gas

How can a ringing telephone can be heard through a closed door