Answer:
C3H6
Explanations:
Given the following parameters
%carbon = 85.7%
%Hydrogen = 14.3%
Convert percentage to mass
Mass of carbon = 85.7grams
Mass of Hydrogen = 14.3 grams
Convert mass to moles
Moles of Carbon = 85.7/12 = 7.142moles
Moles of Hydrogen = 14.3/1 = 14.3 moles
Divide by the lowest ratio
For Carbon: 7.142/7.142 = 1
For Hydrogen: 14.3/7.142 = 2.002
Determine the empirical formula
Empirical formula = CH2
Determine the molecular formula
(Empirical formula)n = molar mass of Propylene
(CH2)n = 42
(12 + 2(1))n = 42
14n = 42
n = 42/14
n = 3
Molecular formula = (CH2)3 = C3H6
Therefore the molecular formula of propylene is C3H6