• # question_answer 57)   Which of the following statements is correct about the reaction given below : $4Fe(s)+3{{O}_{2}}(g)\to 2F{{e}_{2}}{{O}_{3}}(g)$ (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. (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.

(a) According to the law of conservation of mass : $\Sigma$ Masses of reactants = $\Sigma$ Masses of products