The dark tarnish that forms on iron pyrite (FeS2) is iron(III) oxide (Fe2O3). Tarnish can be removed by creating a reaction with oxygen (O2). The reaction forms iron(III) oxide and sulfur dioxide (SO2). The chemical equation for the reaction is shown: [FeS2 + O2 →Fe2O3 + SO2] This equation needs to be balanced by adding coefficients in front of the chemical formulas. A partially balanced equation is shown: [2FeS2 + 11O2 →? Fe2O3 + 4SO2] Which coefficient should be added in front of Fe2O3 to balance the equation? You may use the calculator.

The dark tarnish that forms on iron pyrite FeS2 is ironIII o

The dark tarnish that forms on iron pyrite fes2 is ironiii o - GED Practice Questions

Question

The dark tarnish that forms on iron pyrite (FeS₂) is iron(III) oxide (Fe₂O₃). Tarnish can be removed by creating a reaction with oxygen (O₂). The reaction forms iron(III) oxide and sulfur dioxide (SO₂).

The chemical equation for the reaction is shown: [FeS₂ + O₂ →Fe₂O₃ + SO₂]

This equation needs to be balanced by adding coefficients in front of the chemical formulas. A partially balanced equation is shown: [2FeS₂ + 11O₂ →? Fe₂O₃ + 4SO₂]

Which coefficient should be added in front of Fe₂O₃ to balance the equation?

You may use the calculator.

Answers

3
1
6
correct

2

Explanation

The correct answer is: 2

To balance the equation, we need to ensure the number of atoms of each element is equal on both sides. We have 4 Fe atoms on the left (2FeS2), so we need 4 Fe atoms on the right. Fe2O3 contains 2 Fe atoms, so we need a coefficient of 2 to get 4 Fe atoms. This also balances the oxygen atoms: 11O2 (22 O atoms) on the left, and 2Fe2O3 + 4SO2 (6 + 16 = 22 O atoms) on the right.

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