Which of the following is a balanced chemical equation

Asked by maham237 @ in Chemistry viewed by 344 People

. Which of the following is a balanced chemical equation for the synthesis of NaBr from Na and Br2?
Na + Br2 —> NaBr
2Na + Br2 —> NaBr
Na + Br2 —> 2NaBr
2Na + Br2 —> 2NaBr

Answered by maham237 @


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



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