Question

4. What are the empirical for the following substances? Magnetite, a naturally occurring magnetie mineral: 72.36% Fe, 27.64% 0 5-How many moles of solute are present in the following solutions [ 175 ml of 0.67 M glucose (C6H1206) 6- Balancing Chemical Equations: 1) P,000+ H, O H ,PO CoS + CO + Cu → Co (CO), + Cu,s 7- What is the molecular mass of cholesterol if 0.5731 mol weighs 221.6 g?

Answer 1

Magnetice 12.364. Fe and 27.64 % 0 Consider loog of the substance Mass y Fe = 72.36g Mass og o = 21.64 g Moles of F e = 72.36g 55.845 g ind = 1.295 mol Holes of o = 27.64g = 1.127 ml 7g/mol = Moles y fe io = 1.295 : 1.727 Divide both by 1.2.95 Fe : 0 = 1 : 1.333 Multiply by 3 Feio = 3:4 formula is fez oy so, the empirical as Molarity Volume = 0.67M = 175 mL Molarity - Molis Volume in mL) Volume = Эко амаи Malarity X 0.67 x 175 o mal 1000 Todo = 0.11725 mol

P4 90 + оно – чңfo 2) 2 Cos + 8 + ч — Wo, (0) + 2 Cus Q7 Mass = 221.69 Molle =0.5731 mal Moles = given Mass Molecular Mass * Malecular mass = 22.1.63 о. 5131 mg = 386.66 amal