Interpretation:
The molecular formula of the compound needs to be identified.
Concept introduction:
The simplest positive integer ratio of the atoms present in the chemical compound is known as empirical formula. Molecular formula tells about the actual number of atoms of elements present in the given 1 molecule of the compound.
Answer to Problem 16STP
The molecular formula of the compound is C6H12O4
Explanation of Solution
Given information
Total given mass of the unknown molecule is = 25 g
Mass of carbon in the given molecule is = 12.16 gram
Mass of hydrogen in the given molecule is = 2.027 gram
Mass of Oxygen in the given molecule is = 10.81 gram
The Calculation of % composition of carbon in the molecule is shown below:
The Calculation of % composition of hydrogen in the molecule is shown below:
The Calculation of % composition of oxygen in the molecule is shown below:
The Calculation of Empirical formula is shown below:
The calculation of ratio of number of atoms by dividing the each moles of smallest moles is shown below:
Therefore; the ratio is
1.5:3:1
3:6:2
The table of empirical formula is shown below:
Element | % | fraction | ratio | Whole no. |
C | 48.64 | 4.053 | 4.053/2.7025 = 1.5 | 3 |
H | 8.108 | 8.044 | 8.044/2.7025 = 3 | 6 |
O | 43.24 | 2.7025 | 2.7025/2.7025 = 1 | 2 |
Hence the empirical formula is = C3H6O2
The calculation of molecular formula is shown below:
Molecular formula = (Empirical formula)n
Hence, the molecular formula = (C3H6O2)2
= C6H12O4
The molecular formula of the compound is C6H12O4
Chapter 10 Solutions
Chemistry: Matter and Change
Additional Science Textbook Solutions
Chemistry: Structure and Properties (2nd Edition)
Chemistry: Structure and Properties
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