Question

1) Determine the empirical formula of each of the followingcompounds if a sample contains (a) 0.104 mol K, 0.052 mol C, and0.156 mol O; (b) 5.28 g Sn and 3.37 g F; (c) 87.5% N and 12.5% H bymass.

2) Determine the empirical and molecular formulas of each of thefollowing substances:
(a) Ibuprofen, a headache remedy, contains 75.69% C, 8.80% H, and15.51% O by mass, and has a molar mass of 206 g/mol.

3) Nicotin, a component of tobacco, is composed of C, H, and N. A5.250-mg sample of nicotine was combusted, proucing 14.242 mg ofCO2 and 4.083 mg of H2O. What is the empirical formula fornicotine? if nicotine has a molar mass of 160 + 5 g/mol, or 160 - 5g/mol, what is its molecular formula?