1. The mole ratio of H2SO4 and H2O in the equation = 3:3
2. The mole ratio of Mg and Mn in the equation = 3:2
<h3>Further explanation</h3>
Given
Reaction
1. Fe2O3 + H2SO4 → Fe2(SO4)3 + H2O
2. Mg + Mn2O3 → MgO + Mn.
Required
Balanced equation
Solution
1. Fe₂O₃ + H₂SO₄ → Fe₂(SO₄)₃ + H₂O
aFe₂O₃ + bH₂SO₄ → Fe₂(SO₄)₃ + cH₂O
Fe, left = 2a, right=2⇒2a=2⇒a=1
S, left=b, right=3⇒b=3
H, left = 2b, right = 2c⇒2b=2c⇒2.3=2c⇒c=3
The equation becomes :
<em>Fe₂O₃ + 3H₂SO₄ → Fe₂(SO₄)₃ + 3H₂O</em>
2. Mg + Mn₂O₃ → MgO + Mn.
aMg + Mn₂O₃ → bMgO + cMn.
Mn, left=2, right=c⇒c=2
O₂, left=3, right=b⇒b=3
Mg, left = a, right=b⇒a=b⇒a=3
The equation becomes :
<em>3Mg + Mn₂O₃ → 3MgO + 2Mn.</em>
