A 1.02 g magnesium supplement contains 25.0% Mg by mass. The magnesium is present in the supplement as MgO(s) (molar mass 40.30 g/mol).

Variables,control,conclusion and finally scientific theory

Ithink this is what you meant. the temperature at which a liquid begins to boil is called the boiling point. the boiling point of water is 212°f or 100°c.  and at that point will start to turn into steam (gas)

Man i dont know this answer

The answer is c.  h+  and oh−  react to form water (h2o). i just took the test and i got it right. hope this !