Suppose you burn a substance in the air (reactants) and produce smoke and ash (products). The law of conservation of mass states that the mass of your reactants should be the mass of your products.

The same as can best fill the space

Explanation:

The law of conservation of mass states that matter cannot be created or destroyed in a chemical reaction. For example, when wood burns, the mass of the soot, ashes, and gases, equals the original mass of the charcoal and the oxygen when it first reacted.

It shows that when wood burns, it combines with oxygen and changes not only to ashes, but also to carbon dioxide and water vapor. The gases float off into the air, leaving behind just the ashes. Suppose you had measured the mass of the wood before it burned and the mass of the ashes after it burned. Also suppose you had been able to measure the oxygen used by the fire and the gases produced by the fire. What would you find? The total mass of matter after the fire would be the same as the total mass of matter before the burning.

They should be the same mass.

Explanation:

The law of conservation of mass states that- "mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations.

According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants."

Therefore, the mass of the reactant is the same as the mass of the products.

The law of conservation of mass states that in a chemical reaction,the sum of the masses of the reactants is equal to the sum of the masses of the product

The law of conservation of mass also states that the mass of your reactants should be the same as the mass of your products.

Suppose you burn a substance in the air and the substance which burn in air is called reactants and produce smoke and ash . The smoke and ash formed after burning of substance in air is called products.

Reactant : The substance which react in chemical reaction is called reactant.

Products:The substance are produced  after chemical reaction is called  product.

Hence, the law of conservation states that the mass of reactants should be the same as the mass of your products.

the answer is b & c i believe : )

it's all four options.