Question

A student heated 10 g of calcium carbonate (CaCO₃) and obtained calcium oxide and carbon dioxide. If 5.6 g of calcium oxide was produced, what is the mass of carbon dioxide released, according to the Law of Conservation of Mass?

Assertion (A): When 4 g of hydrogen reacts completely with 32 g of oxygen, 36 g of water is formed. Reason (R): Matter is neither created nor destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.

In a group activity, students place 4.0 g of calcium carbonate with 2.92 g of hydrochloric acid in a closed container. After the reaction is over, they measured 1.76 g of carbon dioxide, 0.72 g of water, and 4.44 g of calcium chloride. Verify whether the Law of Conservation of Mass is obeyed or not.

A student burns 10 g of ethanol in an open beaker. After the reaction, no residue is left in the beaker. Does this mean the Law of Conservation of Mass is violated? Explain.

When 20 g of hydrogen reacts completely with 160 g of oxygen, how much water is formed according to the Law of Conservation of Mass?