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Name: Anh Lan Do Course: CHE-131-92L Date: Feb 24th, 2010 world-wide alchemy 1 Experiment 4 Percent spell of a Compound Professor Robert M. Cady Questions: 1. fit to the law of expressed composition, elements form intensifys in the same ratios by plenitude each(prenominal) time the change is produced. Using the supposititious percent by mass of magnesium in MgO, target the mass of group O that will combine with 12.25g of Mg and the mass of MgO that will be formed. 2. Which compound has the greatest percentage by mass of nuclear identification number 12? a) MgCl2 : * MgCl2 = 24.31g + (2* 35.45g) = 95.21g Percentage by mass of Mg: * (24.31g/ 95.21g )* atomic number 6= 25.53 % b) Mg(NO3)2 : * Mg(NO3)2 = 24.31g + 2* (14.01g+(16.00g*3)) = 148.33g Percentage by mass of Mg: * ( 24.

31g/ 148.33g) * coulomb = 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 sulfide is 43.1 % Mg by mass. How many loads of atomic number 16 can be produced by the caloric decomposition of 20.5 tons of ! magnesium sulfide? Lab 4 Objective: The goal of the prove is to find the mass of magnesiumIf you indispensability to get a full-of-the-moon essay, order it on our website: OrderCustomPaper.com

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