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A compound with a formula mass of 42.08 u is found to be 85.64% carbon and 14.36% hydrogen by mass. Find its molecular formula.



Answer :

Percent Mass Percent/mass lowest # #
C 85.64 12 7.13666 /7.1366 1
H 14.36 1 14.36 / 7.1366 2

CH2 this is not in its molecular formula yet the mass doesn't equal 42.08
(CH2)3 mass = 42
It's molecular formula is C3H6

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