Question

a chemical reaction separates water into hydrogen and oxygen gas. which of the following statements is true about the mass of the water and the combined mass of the 2 gases? the mass of the water is greater than the combined mass of the gases the combined mass of the gases is much greater than the mass of the water the mass of the water is the same as double the combined mass of the gases the combined mass of the gases is the same as the mass of the water

Explanation:

According to the law of conservation of mass, in a chemical reaction, the total mass of reactants is equal to the total mass of products. Here, water (\(H_2O\)) is the reactant and hydrogen (\(H_2\)) and oxygen (\(O_2\)) are the products. So the mass of water (reactant) must be equal to the combined mass of hydrogen and oxygen gases (products).

Answer:

The combined mass of the gases is the same as the mass of the water.