Experiment 3 - Experiment 3 Two challenges using stoichiometry and the mole Hi ren Patel Lab Partners Alice Yee Tamiko Washington and Jeremiah

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Unformatted text preview: Experiment 3: Two challenges using stoichiometry and the mole Hi ren Patel Lab Partners: Alice Yee, Tamiko Washington, and Jeremiah Johnson September 17, 2011 Section G14 TA: Erica Chen “ I commit to uphold the ideals of honor and integrity by refusing to betray the trust bestowed upon me as a member of the Georgia Tech community.” I I. Data & Results I I I. Sample Calculations: Molecular weight sample calculation: KOH- K=39.10g + O=16.00g + H=1.008g = 56.108g = 56.11g Moles of Alum = 5.361g used * 2molKAl(SO4)2 * 12H2O/ 474.4 g = 0.042moles 1. Amount of KOH used: 0.569gAl * 1molAl/26.98g * 2mol KOH/2mol Al= 0.021 mole KOH Molarity= moles of solute/liters of solution -> 1.4M= 0.021mol/volume=0.015L -> 0.015 *2= 0.03L *1000ml= 30.0ml 2. Amount of H 2 SO 4 used: 0.569gAl * 1mol al/26.98g Al *4molH2SO4/2mol Al= 0.042 mole H2S04 Molarity= moles of solute/liters of solution-> 9M=0.042mol/Volume=0.00466L 0.00466L * 3 = 0.014*1000ml = 14.0 ml 3. Theoretical yield from the mass of Al used: 10.00g Alum * 1mol/474.4g KAl(SO4)2*12H20 *2mol Al/2mol KAl(SO4)2*12H20 * 26.98gAl/1mol Al= 0.5687 g Al 4. Percent yield: Percent yield= actual yield/theoretical yield *100 Part B. ¿QUÉ PASA? Hypothesis: If the reaction were to be [2Fe(s) + 3CuSO4 *5H2O(aq) -> Fe2(SO4)2(aq) +3Cu(s) +15H2O(l)] instead of [Fe(s) +CuSO4 * 5H2O(aq) -> FeSO4(aq) +Cu(s) +5H2O(l)], then the iron used would be in excess and steel wool would still be present with the formation of Cu precipitate. Experiment 1: 1 gram of steel wool (0.179mol) and 2.856g of CuSO4 (0.1787mol) were measured out. These are mixed into 50ml of water and stirred until the solution is completely blue and none of the original solids still exists. The steel wool is added to the prepared solutions after. still exists....
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This note was uploaded on 09/17/2011 for the course CHEM 1310 taught by Professor Dr.bottomley during the Fall '10 term at Central GA Tech.

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Experiment 3 - Experiment 3 Two challenges using stoichiometry and the mole Hi ren Patel Lab Partners Alice Yee Tamiko Washington and Jeremiah

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