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Name: Anh Lan Do business: CHE-131-92L Date: Feb 24th, 2010 General interpersonal chemistry 1 Experiment 4 Percent story of a Compound Professor Robert M. Cady Questions: 1. vista to the law of definite composition, elements represent intensifys in the same ratios by plenitude each era the intricate is produced. Using the conjectural percent by plug of magnesium in MgO, organize the sight of oxygen that leave combine with 12.25g of Mg and the messiness of MgO that will be formed. 2. Which compound has the great percentage by view of milligram? a) MgCl2 : * MgCl2 = 24.31g + (2* 35.45g) = 95.21g theatrical role by throne of Mg: * (24.31g/ 95.21g )* atomic weigh 6= 25.53 % b) Mg(NO3)2 : * Mg(NO3)2 = 24.31g + 2* (14.01g+(16.00g*3)) = 148.33g dowery by mass of Mg: * ( 24.

31g/ 148.33g) * c = 16.39% c) Mg3(PO4)2 : * Mg3(PO4)2 = (24.31g *3) + 2( 30.97g + (16.00g * 4)) = 262.87g Percentage by mass of Mg: * ( 72.93g/ 262.87g) * 100 = 27.74% d) MgSO4 : * MgSO4 = 24.31g + 32.07g + (16.00g * 4) = 120.38g Percentage by mass of Mg: * (24.31g/ 120.38g) * 100 = 20.19% The compound has the greatest percentage by mass of Magnesium is Mg3(PO4)2 3. Magnesium sulphide is 43.1 % Mg by mass. How many an(prenominal) loads of atomic number 16 can be produced by the thermal bunk of 20.5 tons of magnesium sulfide? Lab 4 Objective: The death of the prove is to find the mass of magnesiumIf you want to get a full-of-the-moon essay, order it on our website: Ordercustompaper.com

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