What is the empirical formula of the phosphorus selenide?

atomic mass of phosphorous = 31g atomic mass of selenium = 79g 45.2/31 = 1.45 which is nearly 1.5 mol of P 131.6 - 45.2 = 86.4g 86.4/79 = 1.09 which is nearly 1 mol of Se So the empirical formula of the phosphorus selenide is: P3Se2