Topic Content:
- Molecular Formula
- Relationship between Empirical and Molecular Formula
- Theory Questions and Answers
The molecular formula of an element or compound is the formula which shows the exact number of atoms present in one molecule of the element or compound.
Relationship between Empirical and Molecular Formula:
(Empirical formula) n = Relative molecular mass
n = The actual number of atoms present in the element or compound.
Relative molecular mass of Empirical formula = Relative molecular mass of the compound
Molecular formula = n × (Empirical formula)
Example 6.9.1:
A hydrocarbon contains 80% carbon and 20% hydrogen.
(a) Find the Empirical Formula of the compound. (b) If the relative molecular mass is 30, find its molecular formula. (H = 1, C = 12)
Solution:
(a)
| C | H | |
| Divide by RAM | \( \frac{80}{12} \) | \( \frac{20}{1} \) |
| \( \scriptsize 6.67 \) | \( \scriptsize 20 \) | |
| Divide by the Smallest Value | \( \frac{6.67}{6.67} \) | \( \frac{20}{6.67} \) |
| 1 | 3 |
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