Question

CuCl2 + Al ---> AlCl3 + Cu

Balance the single replacement chemical reaction.
A) CuCl2 + Al ---> AlCl3 + Cu
B) 3CuCl2 + 2Al ---> 2AlCl3 + 3Cu
C) 2CuCl2 + 3Al ---> 3AlCl3 + 2Cu
D) 3CuCl2 + 3Al ---> 3AlCl3 + 3Cu

Answer 1

B
All the elements have the same amount of atoms.

Answer 2

For a balance chemical equation:

The number of atoms of a molecule should remain conserved that is total number of atom of a molecule in reactant side should equal to the number of atoms of a molecule in the product side.

Here also the number of atoms of an element should remain conserved on both sides, So the answer is option B.

That is

B) 3CuCl₂ + 2Al ---> 2AlCl₃ + 3Cu

Here the number of atoms of Cu, Cl and Al are equal in both side , reactant as well as product.