B , your products are on the right side of the reaction. The reactants are on the left side
The correct answer is A, since it is the only sensible answer.
Answer:
about 79% (79.04369332 to be exact)
Explanation:
Percent composition=(Molar mass of element x amount of it)/Molar mass of compound x 100
Br= 3 x 79.9/303.25 x100=79.04369332