Chemistry - Mole Concept Question with Solution | TestHub

Cortisone contains 21 carbon atoms, so the mass of carbon per mole is $21\times 12=252$ g.

Given carbon percentage = 69.98%, use:

$$\%C=\frac{MassofC}{MolecularMass}\times 100$$

$$MolecularMass=\frac{252\times 100}{69.98}\approx 360.1gmo{l}^{-1}$$

Hence, the correct answer is (B) 360.1 g mol⁻¹.