CBSE Class 11-science Answered
What is the simplest formula of the compound which has the following percentage composition? Carbon 80% and Hydrogen 20%. If the molecular mass is 30, calculate its molecular formula.
Asked by Topperlearning User | 15 Jun, 2016, 01:27: PM
Expert Answer
Calculation of empirical formula:
Element
|
Percentage
|
Atomic mass
|
Relative number of moles
|
Simple ratio
|
Simplest whole number ratio
|
C
H
|
80
20
|
12
1
|
|
|
1
3
|
Therefore Empirical formula is CH3
Calculation of molecular formula:
Empirical formula mass = 12 × 1 + 1 × 3 = 15
Molecular formula = Empirical formula × 2
= CH3 × 2 = C2H6
Answered by | 15 Jun, 2016, 03:27: PM
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