Question

Which of the following are balanced equations? Check all that apply. A. 4Na(s) + O2(g) → 2Na2O(s) B. 2Mg(s) + O2(g) → 2MgO(s) C. C3H8(g) + O2(g) → CO2(g) + H2O(g) D. C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(g

Answer 1

Answer : The correct option is, A, B and D

Explanation :

Balanced chemical reaction : It is defined as the number of atoms of individual elements present on reactant side must be equal to the product side.

(A) $4Na(s)+O_2(g)\rightarrow 2Na_2O(s)$

(B) $2Mg(s)+O_2(g)\rightarrow 2MgO(s)$

(C) $C_3H_8(g)+O_2(g)\rightarrow CO_2(g)+H_2O(g)$

(D) $C_3H_8(g)+5O_2(g)\rightarrow 3CO_2(g)+4H_2O(g)$

From the given reactions, the reaction A, B and D are the balanced chemical reactions because in this reactions the number of atoms of individual elements present in the reactant side are equal to the product side.

While in reaction C the number of individual elements are not equal on both the sides. So, this reaction are not balanced reaction.

Hence, the correct balanced reaction are, A, B and D

Answer 2

Se for no balanceamento e 5.