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Properties of FeSO4

Properties of FeSO4 (Iron(II) sulfate):

Compound NameIron(II) sulfate
Chemical FormulaFeSO4
Molar Mass151.9076 g/mol

Chemical structure
FeSO4 (Iron(II) sulfate) - Chemical structure
Lewis structure
3D molecular structure
Physical properties
AppearanceWhite crystals (anhydrous) White-yellow crystals (monohydrate) Blue-green deliquescent crystals (heptahydrate)
OdorOdorless
Solubility446.9 g/100mL
Density3.6500 g/cm³
Helium 0.0001786
Iridium 22.562
Melting680.00 °C
Helium -270.973
Hafnium carbide 3958
Thermochemistry
Heat Capacity100.60 J/(mol·K)
Boron nitride 19.7
Hentriacontane 912
Enthalpy of Formation-928.40 kJ/mol
Adipic acid -994.3
Tricarbon 820.06
Standard Entropy107.50 J/(mol·K)
Ruthenium(III) iodide -247
Chlordecone 764

Alternative Names

Iron(II) sulphate
Ferrous sulfate, Green vitriol, Iron vitriol, Ferrous vitriol, Copperas, Melanterite, Szomolnokite

Elemental composition of FeSO4
ElementSymbolAtomic weightAtomsMass percent
IronFe55.845136.7625
SulfurS32.065121.1082
OxygenO15.9994442.1293
Mass Percent CompositionAtomic Percent Composition
Fe: 36.76%S: 21.11%O: 42.13%
Fe Iron (36.76%)
S Sulfur (21.11%)
O Oxygen (42.13%)
Fe: 16.67%S: 16.67%O: 66.67%
Fe Iron (16.67%)
S Sulfur (16.67%)
O Oxygen (66.67%)
Mass Percent Composition
Fe: 36.76%S: 21.11%O: 42.13%
Fe Iron (36.76%)
S Sulfur (21.11%)
O Oxygen (42.13%)
Atomic Percent Composition
Fe: 16.67%S: 16.67%O: 66.67%
Fe Iron (16.67%)
S Sulfur (16.67%)
O Oxygen (66.67%)
Identifiers
CAS Number7720-78-7
SMILES[Fe+2].[O-]S([O-])(=O)=O
SMILES[OH2+][Fe-4]([OH2+])([OH2+])([OH2+])([OH2+])[OH2+].[O-]S(=O)(=O)[O-].O
Hill formulaFeO4S

Related compounds
FormulaCompound name
FeSO3Iron(II) sulfite
Fe2(SO4)3Iron(III) sulfate
Fe2(SO3)3Iron(III) sulfite

Sample reactions for FeSO4
EquationReaction type
FeSO4 + NaOH = Fe(OH)2 + Na2SO4double replacement
FeSO4 = Fe2O3 + SO2 + SO3decomposition
Cu + FeSO4 = CuSO4 + Fesingle replacement
Mg + FeSO4 = MgSO4 + Fesingle replacement
FeSO4 + (NH4)2S = FeS + (NH4)2SO4double replacement

Related
Molecular weight calculator
Oxidation state calculator

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