Molecular formulas
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Molecular Formulas. Find empirical formula Calculate molar mass of empirical formula Molar mass of compound / molar mass of empirical formula (we’ll call this the factor) Multiply subscripts by factor to get molecular formula. Molecular Formula.

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Molecular formulas
Molecular Formulas

  • Find empirical formula

  • Calculate molar mass of empirical formula

  • Molar mass of compound / molar mass of empirical formula (we’ll call this the factor)

  • Multiply subscripts by factor to get molecular formula


Molecular formula
Molecular Formula

  • A compound is found to have an empirical formula of C2H3O2. The molar mass of the compound has 118.1 g/mol. What is the molecular formula?

    • Molar mass of C2H3O2

      C2H3O2 = 2x12 + 3x1 + 2x16= 59 g/mol

    • Molar mass of compound / molar mass of empirical

      118.1 / 59 = 2


Molecular formula1
Molecular Formula

  • A compound was found to contain 49.98 g carbon and 10.47 g of hydrogen. The molar mass of the compound is 58.12g/mol. Determine the molecular formula

  • C= 49.98 / 12 = 4.165 / 4.165 = 1 x 2 = 2

  • H= 10.47 / 1 = 10.47 / 4.165 = 2.5 x 2 = 5

  • C2H5 = 2x12 + 5x1 = 29

  • 58.12 /29 = 2

    C2H5

    x2 x2

    C4H10


Molecular formula practice i
Molecular Formula Practice I

1. Analysis of a chemical used in photographic developing fluid indicates a chemical composition of 65.45% C, 5.45% H, and 29.09% O. The molar mass is found to be 110 g/mol. Determine the molecular formula.


Molecular formula practice i1
Molecular Formula Practice I

2. A compound was found to contain 49.98 g carbon and 10.47 g hydrogen. The molar mass of the compound is 58.12 g/mol. Determine the molecular formula.


Molecular formula practice i2
Molecular Formula Practice I

3. A colorless liquid composed of 46.68% nitrogen and 53.32% oxygen has a molar mass of 60.01 g/mol. What is the molecular formula?


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