Molecular formula from empirical formula

• How to calculate a molecular formula if a molar mass is known?

• Empirical formula = CH2O, MM = 90 g/mol

  • What is the molecular formula?

• Empirical formula mass = 12 + 2 + 16 = 30

• The molar mass is 3 x as great, so the molecular formula is three empirical formulas: (CH2O)3 or C3H6O3

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