Interpretation:
The molecular formula is to be calculated using percentage composition.
Concept introduction:
The molecular formula is the formula which gives the whole number ratio of the atoms present in nature.

Answer to Problem 114A
The molecular formula is
Explanation of Solution
To calculate empirical formula of a compound, percentage to the
Element | Percentage | Atomic mass | %/mass | Simple ratio | Whole no. ratio |
C | 57.8 | 12 | 4.82 | 2 | 4 |
O | 38.5 | 16 | 2.40 | 1 | 2 |
H | 3.64 | 1 | 3.64 | 1.5 | 3 |
The simplest whole number ratio is:
Therefore empirical formula is
Empirical formula mass =
= 83
Now applying the formula:
Molecular formula is calculated by multiplying this n with simplest whole number ratio.
Therefore molecular formula is:
The calculations show that the molecular formula is
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