Question

Post-Laboratory Questions 1 1.897 g sample of pure Mg(HCO,), was heated and decomposed. When the sample cooled, it weighed 1.071 g. What is the percent yield of this reaction? Mg(HCO₃)2 -> MgCat Co₂ + H₂O Pleas mg (HCO3)2 = 1.897 146.3491m -0.01296 mol og) formed a Imold ng Cog Imol mg Choz Dorina 0-01296 mol memory Lopuli ここのつけんなっalus] 2) A geologist brought in a sample of ore containing Fe(HCO3), and some other, unreactive material. If the sample weighed 1.394 g, and after decomposition weighed 0.978 .. what is the % Fe(HCO3)3 of the sample? Suppresion -putt meseron-Attky 3) If 2.112 g of Fe2O3 reacts with 0.687 g of Al, how much pure Fe will be produced? Fe,O3(s) + 2 Al (5) A1,03 () + 2 Fe (8)

Answer 1

4. Het les consides a reaction, I Mg (HCO3)2 Mg CO2 (52+ CO2+H₂O moles of Mg(HCO3)2 = Mass molar mass 1.8979 146.34 Olmol Law 962100 = lo salow porucany Embu Lau9b2IQ’OX OoBut law 12 = CENA 7 OW TOCM COOH) bw Low 96210103 - Moles x molass mass Mass Of MgCO2 bomed = 0.01296 mol x 84.314 gmos =110937 Percent yield = mass of sample x100 mass of ragoz 1:07) x100 = 1.1093 = 97,98 %