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Chem 3 Ch8.p3

Molecular Formulas

Molecular Formulas: ProcessAnswer
Molecular Formula Chemical formula indicates the type and the number of atoms in a molecule. Subscripts are actual numbers of atoms per molecule (P4O10= 4 mole P and 10 mole O). Multiply empirical subscripts by n to get molecular subscripts
Molecular formula = n (Empirical Formula)
n= Molar Mass of compound/Empirical Formula Mass
Molecula formula = 2 (P2O5) = P4O10
Molecular Formula from Empirical Formula and Molar Mass: Step 1 Convert each mole of element from Empirical Formula to mass
Molecular Formula from Empirical Formula and Molar Mass: Step 2 Empirical Formula Mass is the total mass of all elements
Molecular Formula from Empirical Formula and Molar Mass: Step 3 Determine "n" by dividing the Molar Mass by the Empirical Formula Mass
Molecular Formula from Empirical Formula and Molar Mass: Step 4 Round "n" to the nearest whole number
Molecular Formula from Empirical Formula and Molar Mass: Step 5 Molecular Formula = n x Empirical Formula
Created by: nikkimem32
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