Which law states that the total mass of the reactants is equal to the total mass of the products in a chemical reaction?

Law of constant proportions

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Law of conservation of energy

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Law of conservation of mass

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Law of multiple proportions

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Solution

The correct option is C Law of conservation of mass
Law of conservation of mass states that in a chemical reaction, the total mass of the product is equal to the total mass of the reactants.

For example
$C a C O_{3} \to C a O + C O_{2}$

The total mass of reactant $C a C O_{3}$
$= 40 + 12 + (16 \times 3) = 100$

The mass of $C a O = 40 + 16 = 56$

Mass of $C O_{2} = 12 + (16 \times 2) = 44$

The total mass of products $C a O + C O_{2} = 56 + 44 = 100$ .

Hence the above example illustrates that the total mass of reactants $=$ total mass of products.

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Similar questions

Q. Assertion :The balancing of chemical equations is based on law of conservation of mass. Reason: Total mass of reactants is equal to total mass of products.

Q. Which law states that in a chemical reaction, the total mass of the products is equal to the total mass of the reactants?

Q. Assertion :When iron is heated with sulphur, iron sulphide is formed. The total mass of iron and sulphur is equal to the mass of iron sulphide. Reason: Law of conservation of mass states that the total mass of reactants = total mass of products.

Which of the following statements is correct about the reaction given below ?

$4 F e (s) + 30_{2} (g) \to 2 F e_{2} 0_{3} (g)$

(a) Total mass of iron and oxygen in reactants = total mass of iron and oxygen in product therefore it follows law of conservation of mass

(b) Total mass of reactants = total mass of product, therefore, law of multiple proportions is followed

(d) Amount of $F e_{2} O_{3}$ produced will decrease if the amount of any one of the reactants (iron or oxygen) is taken in excess

During a physical change or chemical change, the total mass of the products is equal to the total mass of reactants. Which of the following law states that?

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