Answer:

(a) Original: H2 + Cl2 -> HCL

    Balanced: H2 + Cl2 -> 2HCL

(b) Original: Pb + CuCl2 -> PbCl2 +  Cu

    Balanced: Pb + CuCl2 -> PbCl2 + Cu

(c) Original: ZnO + C -> Zn + CO

    Balanced: ZnO + C -> Zn + CO

Step-by-step explanation:

For (a), the left part has two Hs and two Cls. The right has one each. Just multiply the right side HCl making it 2HCL to balance this equation!

For (b) and (c), the left part has the same number of each type of element on the right hand side. Therefore there is no need to do any adjustments.

Answer:

Balancing equation is very important. According to law of conservation of mass,matter can neither be created nor be destroyed in a chemical reaction.....

hope it helps you dear friends......

Have a nice day.....