Conservation of Mass

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If a reaction produces 24 atoms of oxygen, how many atoms of oxygen were present before the reaction?

A 10 gram sample of Mg reacts with oxygen to form 16 g of MgO. How many grams of oxygen reacted?

If a chemical reaction such as photosynthesis begins with 6 atoms of C, how many atoms of C should be present in the products?

If 17 grams of K react with 12 grams of Br, what will be the mass of KBr produced?

If 20 grams of Al reacts with 200 grams of bromide, according to the Law of Conservation of Mass, how many grams of aluminum bromide should be produced?

Which type of system is best for observing the Law of Conservation of Mass?

If 10 atoms of K react with 30 atoms of Cl, how many total atoms of KCl will be present in the products?

If 50 grams of sodium reacts with Cl to form 126 grams of salt. How many grams of Cl reacted?