Which represents the empirical formula for a3b9?

A compound responsible for the odor of garlic has a molecular weight of 146 g/mol. A 0.650 g sample of the compound contains 0.321 g of carbon, 0.044 g 

of hydrogen, and 0.285 g of sulfur. What is the molecular formula of the compound?

A compound containing only sulfur and nitrogen is 69.6% s by mass; the molar mass is 184 g/mol. What are the empirical and molecular formulas of the compound?

Determine the empirical and molecular formula for chrysotile asbestos. Chrysotile has the following percent composition: 28.03% Mg, 21.60% Si, 1.16% H, and 49.21% O. The molar mass for chrysotile is 520.8 g/mol.