Question

A compound is composed of carbon and hydrogen and has a molar mass of 86.0 grams per mole. Its empirical formula is C3H7. What is the molecular formula? show your work

Answer 1

Let the molecular formula of the compound be (C3H7)n

Given, Molar mass of compound =86.2

Molar mass of (C3H7)n=n(3×12+7)=n(43)

⇒n(43)=86.2

⇒n≈2

So, Molecular formula is (C3H7)2 i.e. C6H14

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