Question

aFeS2 + bO2 → XFe2O + ySO2. The above equation balances when:
(a) a = 4, b = 11, x = 2, y = 8 (b) a = 11, b = 4, x = 8, y = 2
(c) a = 2, b = 4, x = 8, y = 2 (d) a = 4, b = 11, x = 8, y = 2

Answer 1

Answer:

Right answer is a.

4FeS2 + 11O2 -----> 2Fe2O3 + 8SO2

Answer 2

4FeS₂ + 11O₂ → 2Fe₂O₃ + 8SO₂ will be the balanced equation.

(Option a)

Given,

aFeS₂ + bO₂ → xFe₂O₃ + ySO₂

To Find,

The values of a, b, x, and y.

Solution,

To balance the chemical equation,

aFeS₂ + bO₂ → xFe₂O₃ + ySO₂

we can check the options -

(a) a = 4, b = 11, x = 2, y = 8

Putting the values in the equation we get,

4FeS₂ + 11O₂ → 2Fe₂O₃ + 8SO₂

The initial number of Fe atoms = The Final Number of Fe atoms = 4

The initial number of S atoms = The Final Number of S atoms = 8

The initial number of O atoms = The Final Number of O atoms = 22

Hence this is a balanced equation.

(b) a = 11, b = 4, x = 8, y = 2

Putting the values in the equation we get,

11FeS₂ + 4O₂ → 8Fe₂O₃ + 2SO₂

The initial number of Fe atoms ≠ The Final Number of Fe atoms

The initial number of S atoms ≠ The Final Number of S atoms

The initial number of O atoms ≠ The Final Number of O atoms

Hence this is not a balanced equation.

(c) a = 2, b = 4, x = 8, y = 2

Putting the values in the equation we get,

2FeS₂ + 4O₂ → 8Fe₂O₃ + 2SO₂

The initial number of Fe atoms ≠ The Final Number of Fe atoms

The initial number of S atoms ≠ The Final Number of S atoms

The initial number of O atoms ≠ The Final Number of O atoms

Hence this is not a balanced equation.

(d) a = 4, b = 11, x = 8, y = 2

Putting the values in the equation we get,

4FeS₂ + 11O₂ → 8Fe₂O₃ + 2SO₂

The initial number of Fe atoms ≠ The Final Number of Fe atoms

The initial number of S atoms ≠ The Final Number of S atoms

The initial number of O atoms ≠ The Final Number of O atoms

Hence this is not a balanced equation.

Therefore, option a is correct and the balanced equation is

4FeS₂ + 11O₂ → 2Fe₂O₃ + 8SO₂

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