what is the molecular formula of styrene?

Question

Styrene has 92.26% of Carbon and 7.74% of Hydrogen. Further experimentation determines that the molecular weight of this compound is 78.11 grams per mole. What is the molecular formula of styrene?

btw, if someone could generally state how to find the molecular formula, it would be really helpful. I understand how to find empirical formulas but i don't understand how to find the molecular formulas..

Answer 1

No of mol of each element = percentage by mass / molar mass

C: 92.26 / 12.0 = 7.689
H: 7.74 / 1.0 = 7.74

Simplest mole ratio

C: 1 , H: 1

Empirical formula of styrene = CH

Molecular formula = (empirical formula)n, where n = Molar mass of molecular formula / mass of empirical formula.

n = 78.11/(1.0 + 12.0)
= 6

Hence, molecular formula: C6H6

However, the molar mass given in the question appears to be wrong, since the molar mass of styrene is 104.15 g/mol. C6H6 is the molecular formula of benzene.

Answer 2

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RE:
what is the molecular formula of styrene?
Styrene has 92.26% of Carbon and 7.74% of Hydrogen. Further experimentation determines that the molecular weight of this compound is 78.11 grams per mole. What is the molecular formula of styrene?

Answer 3

Basic styrene is C8 H8

How to calculate emprical formulae
http://library.thinkquest.org/3659/chmreact/formula.html

Answer 4

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Answer 5

C6H5CH=CH2