4FeS2 + 11O22Fe2O3 + 8SO2

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Word Equation

Pyrite + Dioxygen = Hematite + Sulfur Dioxide

FeS2 + O2 = Fe2O3 + SO2 is a Double Displacement (Metathesis) reaction where four moles of Pyrite [FeS2] and eleven moles of Dioxygen [O2] react to lớn form two moles of Hematite [Fe2O3] and eight moles of Sulfur Dioxide [SO2]


  • Pyrite - FeS2

    Fool's Gold Iron Pyrite

  • Dioxygen - O2

    Lox Liquid Oxygen Oxygen Gas Triplet Oxygen Diatomic Oxygen Molecular Oxygen Oxygen O₂


  • Hematite - Fe2O3

    Iron(3+);Oxygen(2-) Haematitis Of Pliny Raphisiderite Oligiste Blood Stone

  • Sulfur Dioxide - SO2

    Sulphur Dioxide R-764 Sulfurous Anhydride So2 Sulphur Dioxide , Sulfur Dioxide Sulfur Oxide Sulfurous Oxide Sulfurous Acid Anhydride


Thermodynamics of the reaction can be calculated using a lookup table.

No state of matter options are available for this reaction.

Is the Reaction Exothermic or Endothermic?

FeS2 (s pyrite)4 mol-178.2384 kJ/mol712.9536 kJ
O2 (g)11 mol0 kJ/mol-0 kJ
Fe2O3 (s hematite)2 mol-824.248 kJ/mol-1648.496 kJ
SO2 (g)8 mol-296.829696 kJ/mol-2374.637568 kJ
ΣΔH°f(reactants)-712.9536 kJ
ΣΔH°f(products)-4023.133568 kJ
ΔH°rxn-3310.179968 kJ

ΣΔH°f(reactants) > ΣΔH°f(products), sánh FeS2 + O2 = Fe2O3 + SO2 is exothermic (releases heat).

Is the Reaction Exoentropic or Endoentropic?

ΔS = Sproducts - Sreactants. If ΔS < 0, it is exoentropic. If ΔS > 0, it is endoentropic.

FeS2 (s pyrite)4 mol52.9276 J/(mol K)-211.7104 J/K
O2 (g)11 mol205.028552 J/(mol K)-2255.314072 J/K
Fe2O3 (s hematite)2 mol87.40376 J/(mol K)174.80752 J/K
SO2 (g)8 mol248.1112 J/(mol K)1984.8896 J/K
ΣΔS°(reactants)2467.024472 J/K
ΣΔS°(products)2159.69712 J/K
ΔS°rxn-307.327352 J/K

ΣΔS°(reactants) > ΣΔS°(products), sánh FeS2 + O2 = Fe2O3 + SO2 is exoentropic (decrease in entropy).

Is the Reaction Exergonic or Endergonic?

ΔG = Gproducts - Greactants. If ΔG < 0, it is exergonic. If ΔG > 0, it is endergonic.

FeS2 (s pyrite)4 mol-166.9416 kJ/mol667.7664 kJ
O2 (g)11 mol0 kJ/mol-0 kJ
Fe2O3 (s hematite)2 mol-742.2416 kJ/mol-1484.4832 kJ
SO2 (g)8 mol-300.193632 kJ/mol-2401.549056 kJ
ΣΔG°(reactants)-667.7664 kJ
ΣΔG°(products)-3886.032256 kJ
ΔG°rxn-3218.265856 kJ

ΣΔG°(reactants) > ΣΔG°(products), sánh FeS2 + O2 = Fe2O3 + SO2 is exergonic (releases energy).

Reaction Expressions

Kc or Q = ( [Fe2O3]2 [SO2]8 ) / ( [FeS2]4 [O2]11 )

(assuming all reactants and products are aqueous. substitutue 1 for any solids/liquids, and Psubstance for gases.)

rate = -1/4 * (Δ[FeS2] / Δt) = -1/11 * (Δ[O2] / Δt) = 50% * (Δ[Fe2O3] / Δt) = 1/8 * (Δ[SO2] / Δt)

(assuming constant volume in a closed system and no accumulation of intermediates or side products)


To balance a chemical equation, enter an equation of a chemical reaction and press the Balance button. The balanced equation will appear above.

  • Use uppercase for the first character in the element and lowercase for the second character. Examples: Fe, Au, Co, Br, C, O, N, F.
  • Ionic charges are not yet supported and will be ignored.
  • Replace immutable groups in compounds to lớn avoid ambiguity. For example, C6H5C2H5 + O2 = C6H5OH + CO2 + H2O will not be balanced, but XC2H5 + O2 = XOH + CO2 + H2O will.
  • Compound states [like (s) (aq) or (g)] are not required.
  • You can use parenthesis () or brackets [].

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Practice Balancing

Balance FeS2 + O2 = Fe2O3 + SO2 Using the Algebraic Method

How To Balance FeS2 + O2 = Fe2O3 + SO2

To balance the equation FeS2 + O2 = Fe2O3 + SO2 using the algebraic method step-by-step, you must have experience solving systems of linear equations. The most common methods are substitution/elimination and linear algebra, but any similar method will work.

Step 1: Label Each Compound With a Variable

Label each compound (reactant or product) in the equation with a variable to lớn represent the unknown coefficients.

a FeS2 + b O2 = c Fe2O3 + d SO2

Step 2: Create a System of Equations

Create an equation for each element (Fe, S, O) where each term represents the number of atoms of the element in each reactant or product.

Fe:	1a	+	0b	=	2c	+	0d
S:	2a	+	0b	=	0c	+	1d
O:	0a	+	2b	=	3c	+	2d

Step 3: Solve For All Variables

Use substitution, Gaussian elimination, or a calculator to lớn solve for each variable.

  • 1a - 2c = 0
  • 2a - 1d = 0
  • 2b - 3c - 2d = 0

Use your graphing calculator's rref() function (or an online rref calculator) to lớn convert the following matrix into reduced row-echelon-form:

[ 1	 0	-2	 0	0]
[ 2	 0	 0	-1	0]
[ 0	 2	-3	-2	0]

The resulting matrix can be used to lớn determine the coefficients. In the case of a single solution, the last column of the matrix will contain the coefficients.

Simplify the result to lớn get the lowest, whole integer values.

  • a = 4 (FeS2)
  • b = 11 (O2)
  • c = 2 (Fe2O3)
  • d = 8 (SO2)

Step 4: Substitute Coefficients and Verify Result

Count the number of atoms of each element on each side of the equation and verify that all elements and electrons (if there are charges/ions) are balanced.

4 FeS2 + 11 O2 = 2 Fe2O3 + 8 SO2

Reactants Products

Since there is an equal number of each element in the reactants and products of 4FeS2 + 11O2 = 2Fe2O3 + 8SO2, the equation is balanced.

Balance FeS2 + O2 = Fe2O3 + SO2 Using Inspection

The law of conservation of mass states that matter cannot be created or destroyed, which means there must be the same number atoms at the kết thúc of a chemical reaction as at the beginning. To be balanced, every element in FeS2 + O2 = Fe2O3 + SO2 must have the same number of atoms on each side of the equation. When using the inspection method (also known as the trial-and-error method), this principle is used to lớn balance one element at a time until both sides are equal and the chemical equation is balanced.

Step 1: Count the number of each element on the left and right hand sides

Reactants (Left Hand Side)Products (Right Hand Side)

Step 2: Multiply coefficients for compounds to lớn balance out each element

For each element that is not equal, try to lớn balance it by adding more of it to lớn the side with less. Sometimes there may be multiple compounds with that element on one side, sánh you'll need to lớn use your best judgement and be prepared to lớn go back and try the other options.

  1. Fe is not balanced. Add 1 molecule of FeS2 to lớn the reactant (left-hand) side to lớn balance Iron:
    2FeS2 + O2 = Fe2O3 + SO2

  2. S is not balanced. Add 3 molecules of SO2 to lớn the product (right-hand) side to lớn balance Sulfur:
    2FeS2 + O2 = Fe2O3 + 4SO2

  3. O is not balanced. Add 10 molecules of O2 to lớn the reactant (left-hand) side to lớn try to lớn balance Oxygen:
    2FeS2 + 11O2 = Fe2O3 + 4SO2

  4. O is not balanced. Add 1 molecule of Fe2O3 to lớn the product (right-hand) side to lớn balance Oxygen:
    2FeS2 + 11O2 = 2Fe2O3 + 4SO2

  5. Fe is not balanced. Add 2 molecules of FeS2 to lớn the reactant (left-hand) side to lớn balance Iron:
    4FeS2 + 11O2 = 2Fe2O3 + 4SO2

    Xem thêm: bài 8 địa lí 7 kết nối tri thức

  6. S is not balanced. Add 4 molecules of SO2 to lớn the product (right-hand) side to lớn balance Sulfur:
    4FeS2 + 11O2 = 2Fe2O3 + 8SO2


Step 3: Verify that the equation is balanced

Since there are an equal number of atoms of each element on both sides, the equation is balanced.

4FeS2 + 11O2 = 2Fe2O3 + 8SO2