11. The empirical formula of a compound, $\text{CHCl}$ (Lindane), is a powerful insecticide. The molar mass of lindane is 290.8 g/mol. How many atoms of carbon does a molecule of lindane contain?
(A) 3
(B) 4
(C) 5
(D) 6

這題在考什麼觀念實驗式（empiri...