Answer :
The empirical formula of a compound that has the following percent composition; 81.68% carbon and 18.32% hydrogen is C2H5.
How to calculate empirical formula?
The empirical formula is a notation indicating the ratios of the various elements present in a compound, without regard to the actual numbers.
The empirical formula of a compound that has 81.68% carbon and 18.32% hydrogen can be calculated as follows:
- 81.68% C = 81.68g
- 18.32% H = 18.32g
First, we convert mass to moles;
- C = 81.68g ÷ 12g/mol = 6.81mol
- H = 18.32 ÷ 1g/mol = 18.3mol
Next, we divide each mole value by the smallest (6.81mol)
- C = 6.81 ÷ 6.81 = 1
- H = 18.32 ÷ 6.81 = 2.7
We multiply each ratio by 5 to make an whole number:
- C = 1 × 2 = 2
- H = 2.7 × 2 = 5.4 = 5
Therefore, the empirical formula of a compound that has the following percent composition; 81.68% carbon and 18.32% hydrogen is C2H5.
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