Question

. Which of the following is a balanced chemical equation for the synthesis of NaBr from Na and Br2?

Answer 1

I think the correct answer from the choices listed above is the last option. The balanced chemical equation for the synthesis of NaBr from Na and Br2 would be 2Na + Br2 —> 2NaBr. It should be that the number of atoms in the reactant and in the product side is equal. Hope this answers the question.

Answer 2

Answer: The correct option is:

$2Na+Br_2\rightarrow 2NaBr$

Explanation:

In balanced chemical equation , mass of the reactants is always equal to the mass of the products.

$2Na+Br_2\rightarrow 2NaBr$

This is the balanced equation because on both sides number of sodium and bromine atoms are same.

On the reactant side there are two sodium atoms and two bromine atoms

On the product side there are also two sodium atoms and two bromine atoms in NaBr.

Mass of reactants (here 2Na and $Br_2$)= Mass of products(here 2NaBr)

2(23u) + 2(79.9u) = 2(23u + 79.9u) = 205 u