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What is the Molecular Formula?
The molecular formula represents the actual formula of a compound and gives the composition of the molecule
The Empirical Formulas vs the Molecular Formulas
Steps for Determining the Molecular Formula
1) Find the empirical formula
1) n= molecular molar mass empirical formula mass
2) n x empirical formula= molecular formula
Exercises
1. Calculate the molecular formula of a compound with the empirical formula CH2O and a molar mass of 150 g/mol.
2. Acetylene gas is 92.3 % carbon and 7.7 % hydrogen (by mass), and its molar mass is 26 g/mol. What is its molecular formula?
3. The empirical formula of a compound is known to be CH2, and its molar mass is 56 g/mol. What is its molecular formula?
4. A compound contains 12.8% C, 2.1 % H, and 85.1 % Br (by mass). Calculate the empirical formula and the molecular formula of this compound given the molar mass is 188 g/mol.
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