Question

Balance the following reaction:

A2B + DC3 --> AC + D2B3


Hint: Don't do this in your head. Use a piece of paper and a pencil.


When this reaction is balanced, what number must be to the left of AC?

Answer 1

6 is the correct answer

Answer 2

The balanced reaction is as below

3A₂B + 2DC₃→ 6 AC + D₂B₃

The number that must be to the left of AC is 6

Explanation

• According to the law of mass conservation , the number of atoms in reactant side must be equal to number to the number of atoms in product side.

• Therefore the equation above is balance since it obey the law of mass conservation.

• For example there is 6 atoms of A in reactant side and 6 in product side.