Question

Which of the following statements is correct about the reaction given below?
$4Fe\left(s\right)+3O_2\left(g\right)\to 2F{e}_2{O}_3\left(g\right)$

• A. The total mass of reactants $=$ Total mass of the products. It follows the law of conservation of mass.
• B. The total mass of reactants $=$ Total mass of the products. Therefore, the law of multiple proportions is followed.
• C. Amount of $F{e}_2{O}_3$ can be increased by taking any one of the reactants (iron or oxygen) in excess.
• 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.

Answer 1

The correct option is A The total mass of reactants $=$ Total mass of the products. It follows the law of conservation of mass.

Total mass of iron and oxygen in reactants $=4\left(55.85\right)+3\left(32\right)=319.4g$.

Total mass of iron and oxygen in product $=2(2\times 55.85+3\times 8)=319.4g$.

The total mass of iron and oxygen in reactants = the total mass of iron and oxygen in the product, therefore, it follows the law of conservation of mass.

Hence, option $A$ is correct.