Question

Balance the equation stepwise.
H₂S₂O₇(l) + H₂O(l) → H₂SO₄(l)

Answer 1

 H₂S₂O₇(l) + H₂O(l) → H₂SO₄(l)
Step 1: Count the number of each atom on the reactant side:

Elements	No. of atoms in the reactant
H	4
S	2
O	8

Step 2: Count the number of each atom on the product side:

Elements	No. of atoms in the product
H	2
S	1
O	4

Step 3: Number of atoms of elements on both side is not the same.

If we multiply the product side by 2, then the number of atoms in the product and reactant side gets balanced.

Elements	No. of atoms in the reactant	No. of atoms in the product
H	4	2 × 2 = 4
S	2	1 × 2 = 2
O	8	4 × 2 = 8

H₂S₂O₇(l) + H₂O(l) → 2H₂SO₄(l)