For example, in Simkovich, George. Transport in nonstoichiometric compounds. , it is given that the mole ratio of Cu and Fe is 1.33:1.00. From that the compound formula is written as Cu1.244Fe0.933S2.00. I would like to know how the numbers 1.244 and 0.933 were found. I know that the molar masses of Cu and Fe are respectively 63.55 and 55.85.
Carmen Mateescu
In order to determine a molecular formula of any compound, we must know its molecular mass. Maybe the document mentioned also the molecular mass, that is 195,16, according to the given formula. The fractional numbers of atoms composing the chemical formula were found by knowing the molecular mass and respecting the indicated mole ratio Cu:Fe of 1.33:1.00.
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