10. A 3.192 gram sample of magnesium sulfate was heated in a beaker. 10 minutes after heating was completed, the mass of the sample was 1.559g. No chemical reaction occurred. What is the molecular formula for the sample of magnesium sulfate that was heated? Show all work. (5 pts)
11. The empirical formula of a compound is C3H2O. If the molar mass of the compound is found to be 216 g/mol, find the molecular formula (true formula). You must show all work with the units.
(3 pts)
12. Determine the empirical formula of the following compound if a sample contains 55.80 % carbon, 7.038 % hydrogen, and 37.17 % oxygen by mass. You must show all work with the units.