Answer:
option 3.
2Cr(NO₃)₃ + 3 FeSO₄ → 3 Fe(NO₃)₂ + Cr₂(SO₄)₃
Explanation:
Balance Chemical Equation:
A balanced chemical equation is that in which the number of the reactant atoms equal to the number of the product atom.
For example if the oxygen at the reactant side is 4, the number of oxygen must be 4 on the product side.
Solution
Check each equation one by one
1. Cr(NO₃)₃ + 2 FeSO₄ → 2 Fe(NO₃)₂ + Cr₂(SO₄)₃
Number of atoms of Reactant:
Cr = 1
N = 3
O = 17
Fe = 2
S = 2
Number of atoms of Reactant:
Cr = 2
N = 4
O = 24
Fe = 2
S = 3
So this is not a balance equation as the atoms of the reactant atom not equal to the product atoms.
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2. 2Cr(NO₃)₃ + 2 FeSO₄ → 2 Fe(NO₃)₂ + Cr₂(SO₄)₃
Number of atoms of Reactant:
Cr = 2
N = 6
O = 26
Fe = 2
S = 2
Number of atoms of Reactant:
Cr = 2
N = 4
O = 24
Fe = 2
S = 3
So this is not a balance equation as the atoms of the reactant atom not equal to the product atoms.
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3.
2Cr(NO₃)₃ + 3 FeSO₄ → 3 Fe(NO₃)₂ + Cr₂(SO₄)₃
Number of atoms of Reactant:
Cr = 2
N = 6
O = 30
Fe = 3
S = 3
Number of atoms of Reactant:
Cr = 2
N = 6
O = 30
Fe = 3
S = 3
So this is a balance equation as the atoms of the reactant atom are equal to the product atoms.
Note** you write Cu and Cl instead of Cr, So that was also corrected.
