If the molecular weight of hydrogen is four and that of oxygen is twelve, when mixed together, which of the following would be the molecular weight?

What is the mass of the magnesium?

What is the mass of the oxygen?

What is TOTAL mass of the reactants?

What is the mass of the products?

Does this experimental data support the Law of Conservation of Mass?

Based on the Law of Conservation of Mass, predict the minimum amount of magnesium that is need in the chemical formula above.

Assuming that magnesium and oxygen will react completely with one another, predict the mass of magnesium oxide that will be produced.

Predict the mass of oxygen that will be left over after the reaction of 48.6 grams of magnesium with 50.0 grams of oxygen.

If 500 grams of the first substance decomposes to form 323.20 of N2. How much Na is produced?