Question

Can some please help me?

1) Balance the equation Fe2O3 + H2SO4 → Fe2(SO4)3 + H2O.

What is the mole ratio of H2SO4 and H2O in the equation?

1:3

3:2

2:1

3:3

2)Balance the equation Mg + Mn2O3 → MgO + Mn.

What is the mole ratio of Mg and Mn in the equation.

1:1

2:1

3:2

4;2

Answer 1

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

Further explanation

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

• Give a coefficient

aFe₂O₃ + bH₂SO₄ → Fe₂(SO₄)₃ + cH₂O

• Make an equation

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 :

Fe₂O₃ + 3H₂SO₄ → Fe₂(SO₄)₃ + 3H₂O

2. Mg + Mn₂O₃ → MgO + Mn.

• Give a coefficient

aMg + Mn₂O₃ → bMgO + cMn.

• Make an equation

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 :

3Mg + Mn₂O₃ → 3MgO + 2Mn.