How many atoms, molecules, or formula units of the substance are in the following amounts? a) 3.50 mol of O2 b) 2.75 g of S8 c) 5.50 g of C12H22O11 d) 5.00 g of Al(NO3)3 e) 5.00 mL of ethanol, CH3CH2OH, density = 0.790 g/mL f) a sphere of chromium metal, 0.343 mm in diameter. The density of chromium is 7.20 g/cm3​