Discussion
The empirical formula of an organic compound is CH2 . The molar mass of the compound is 56g mol−1 . The organic compound is
Answer: E
The compound is cyclobutane.
The empirical formula mass of CH2 is 14, so the multiplier is \(\frac{56}{14} = 4\) and the molecular formula is C4H8. Of the options, only cyclobutane has this formula.
n-Butane and 2-methylpropane are C4H10 (58), propene is C3H6 (42, which has the right empirical formula but the wrong mass), and propane is C3H8.
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