3.x Conservation Of Mass (GCSE Chemistry)

What principle states that the total mass before a reaction equals the total mass afterward?

When a substance burns in 23g of oxygen, producing an oxide, how many grams of product result if the substance weighed 50g before burning?

Iron combines completely with 32g of sulfur forming iron sulfide. If 56g of iron are used, what is the total mass of iron sulfide formed?

Lithium (7g) reacts with water (18g). How much lithium hydroxide and hydrogen gas are produced in total?

If hydrogen (4g) reacts with oxygen (32g), how much water is produced?

Lead nitrate decomposes completely into lead oxide, nitrogen dioxide and oxygen. If the mass of lead nitrate is 33.1g, what will be the combined mass of the products?

Copper (64g) reacts with oxygen (16g). What is the mass of the copper oxide produced?

Potassium (3.9g) reacts with oxygen (3g) to form potassium oxide. What mass of potassium oxide results from this reaction?

In a reaction 20g of reactants produce 20g of products. This demonstrates:

During a lab experiment, 50g of reactants are used. What mass of products should form according to the law of conservation of mass?

Sodium carbonate (106g) reacts fully with calcium chloride (111g) producing calcium carbonate and sodium chloride. What`s the total mass of products?