Question

Worksheet: Calculating Empirical & Molecular Formulas
1. The empirical formula for the compound having the formula H2C204 is
[A]
C2H2 [B] CO2H
[C] COH
[D] C204H2 [E] COH2

2.
Calculate the empirical formula of a compound that is 85.6% C and 14.4% H (by mass).
[A] CH2
CH2 [B] CH[C] C3H5
[D] C2H4
[E] C2H​

Answer 1

Answer:

Let us understand the calculations of molecular mass from the following example.

Two organic compounds, one present in vinegar (molar mass: 60 g mol–1), another one present in sour milk (molar mass 90 g mol–1) have the following mass percentage composition. C-40%, H-6.6% ; O-53.4%. Find their molecular formula.

Since both compounds have same mass percentage composition, their empirical formula are the same as worked out in the example problem no 2. Empirical formula is CH2O. Calculated empirical formula mass (CH2O) = 12 + (2…1) + 16 = 30 g mol–1.

Formula for the compound present in vinegar

Calculation of molecular formula for the compound present in sour milk.

Explanation:

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