A hydrocarbon contains 85.7% carbon and 14.3% hydrogen by mass. Its molar mass is 56 g/mol. What is its molecular formula?
Options
A
CH₂
B
C₂H₄
C
C₃H₆
D
C₄H₈
Answer & Analysis
Answer
D
Analysis
Question Analysis
This question involves a two-step calculation: first determining the empirical formula from percent composition, then finding the molecular formula using molar mass. The main focus is on integrating both core skills for empirical and molecular formula problems.
Key Concept Explanation
1. Empirical formula: Simplest whole-number atom ratio, calculated from mass percentages.
2. Molecular formula: , where
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