Summary:
- 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.