1) Analysis of a salt results in the following composition: 3.47 g sodium; 2.12 g nitrogen and 7.27 of oxygen. What is the empirical formula for this salt?
2) A barium salt is found to contain 21.93 g barium, 5.12 g of sulfur, and 10.24 g of oxygen. What is the simplest formula of this compound?
3) An ore containing zinc, carbon and oxygen and weighing485.35 g is analyzed and found to contain 46.59 g of carbon and 186.37 g of oxygen. What is the simplest formula for this compound?