• Molecular formulas give the kind and number of atoms of each element present in a molecular compound.
  • In many cases, the molecular formula is the same as the empirical formula.
  • Chemists use an instrument called a mass spectrometer to determine the molar mass of compounds.
  • The empirical formula of a compound of boron and hydrogen is BH3.
  • The molecular formula of the compound is B2H6.
  • A procedure is described that allows the calculation of the exact molecular formula for a compound.
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