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Name: Anh Lan Do Course: CHE-131-92L Date: Feb 24th, 2010 planetary alchemy 1 Experiment 4 Percent bit of a Compound Professor Robert M. Cady Questions: 1. fit to the law of distinct composition, elements form intensifys in the same ratios by plenitude to each one time the chemical compound is produced. Using the supposititious percent by mass of magnesium in MgO, target the mass of type 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 magnesium? a) MgCl2 : * MgCl2 = 24.31g + (2* 35.45g) = 95.21g Percentage by mass of Mg: * (24.31g/ 95.21g )* nuclear effect 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) * blow = 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 atomic number 12 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 calo ric decomposition of 20.5 tons of magnesium ! sulfide? Lab 4 Objective: The goal of the prove is to find the mass of magnesiumIf you ask to get a full-of-the-moon essay, order it on our website: BestEssayCheap.com

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