Balance these equations: H² + Br² = HBr

Mg + O² = MgO

H² + O² = H²O​

If the atomic mass of an atom is 34 and the atom contains 13 protons, how many neutrons does the atom contain?

In the reaction between a crushed antacid tablet and vinegar what gas is emitted

Upon decomposition, one sample of magnesium fluoride produced 1.65 kg of magnesium and 2.56 kg of fluorine. a second sample produced 1.32 kg of magnesium. part a how much fluorine (in grams) did the second sample produce?