Molecular Formula 1
Molecular Formula: The actual formula for a molecule.
A compound has an empirical formula of ClCH2 and a molecular weight of 98.96 g/mol. What is its molecular formula?
- Find the mass of the empirical unit.
Mass of empirical unit = mass Cl + mass C + 2(mass H)
Mass of empirical unit = 35.45 + 12.00 + 2(1.008) = 49.47 g/mol
- Figure out how many empirical units are in a molecular unit.
# of empirical units = (mass of molecular unit/ mass of empirical unit)
(98.96 g/mol) / (49.47 g/mol) = 2.000 empirical units per molecular unit
- Write the molecular formula.
It takes two empirical units to make a molecular unit, so, the molucular