Molecular Formula 1.3

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Molecular Formula 1

Problem:

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 formula is:
Cl2C2H4

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