0.2429 g sample of potassium is heated in oxygen 0.440 g of a crystalline compound is obtained. What is the formula of this compound?

Mass of K= 0.242 g, rmss of compound = 0.440 g ,mass of O = 0.440-0.242  = 0.198 g Relative molar ratio of K=0.24239=0.0006,  Relative molar ratio of O=0.19816=0.012Simple ratio of K = 1Simple ratio of O = 2So, the formula is KO2.