Mole ConceptHard

Question

A drug, marijuana, owes its activity to tetrahydrocannabinol, which contains 70 per cent as many carbon atoms as hydrogen atoms and 15 times as many hydrogen atoms as oxygen atoms. The number of moles in a gram of tetrahydrocannabinol is 0.00318. Determine its molecular formula.

Options

A.CH3O2
B.C21H30O2
C.C15H30O2
D.C70H15O

Solution

Molecular formula of tetrahydrocannabinol = C10.5xH15xOx

As $\frac{1.0}{157x} = 0.00318 \Rightarrow x = 2$

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