Which of these equations is balanced? a. H2SO4 + 2Al → Al2 (SO4) 3 + H2 b. 2KCl + Pb (NO3) 2 → 2KNO3 + PbCl2

The answer is B, you just check if it is the same on the left and right side

A:

Left side - Right side

2xH - 2xH

1xS - 3xS

4xO - 12xO

2xAl - 2xAl

Therefore A is not correct

B:

Left side - right side

2xK - 2xK

1xCl - 1xCl

1xPb - 1xPb

2xN - 2xN

6xO - 6xO

B is therefore correct as both sides add up

A is not, left side has too little SO4

v is correct, it is balanced, just make sure the elements of each side are the same