Thermochemistry

Rodaan Peralta-Rabang Partners: Doug Brown and Griffin Keeler October 26, 2009 Instructor: Dr. Goldman T.A.: Omar Course: CH119 Thermochemistry: Abbreviated examination ground Report Reaction # Reaction Type DH (J) Moles of maven reactant DHrxn (kJ/ mol) 1 Acid-Base Reaction -1453.94 0.025mols H+ -58.1576 2 Acid-Base Reaction -1223.82 0.025mols NH4+ -48.9528 3 oxidoreduction -2301.2 0.00506mols Mg2+ -454.7826 4 Redox -460.24 0.001866mols Zn2+ -246.645 5 ruin -627.6 0.009986mols SO4+ -62.84799 6 Precipitation -297.064 0.01mols Cu2+ -29.4064 7 decay 225.936 0.02mols K+ 11.2968 8 Dissolution -1154.784 0.0328mols Ca2+ -35.2068 9 Redox -512.54 9.9974E-4 mols Mn2+ -512.6697 10 Dissolution 355.64 0.03004 mols NH4+ 11.83843 Balanced chemical Equations of Reactions: 1. HCl(aq) + NaOH(aq) à H2O(l) + NaCl(aq) 2. CH3COOH(aq) +NH3(aq) à CH3COONH4(aq) + H2O(l) 3. Mg(s)+2HCl(aq) àMg2+(aq) +2Cl-(aq) +H2(g) 4. Zn(s)+2HCl(aq) àZn2+(aq) +2Cl-(aq) +H2(g) 5. BaCl2(2H2O) (aq) + H2SO4(aq) à BaSO4(s) + 2HCl(aq) + 2H2O(l) 6. Cu2+(aq) + 2OH-(aq) à Cu(OH)2 (aq) 7. KI(s) à K+(aq) + I-(aq) 8. CaCl2(s) à Ca2+(aq) + 2Cl-(aq) 9. 5Fe2+(aq) + 8H+(aq) + MnO4- (aq) à 5Fe3+(aq) + Mn2+(aq) + 4H2O(l) 10.

NH4Cl(s) à NH4+(aq) + Cl-(aq) Sample Calculation for DHrxn (kJ/mol) of Reaction 1: DH= (mass of solution)(specific heat)( Dtemperature) + (heat expertness of calorimeter) = (50g)(4.184J/goC)(28.1-21.75) + (125.52J) = 1453.94 J 25mL of HCl is equal to 0.025L of HCl x 1mol/L = 0.025mols of H+ DH/mol = -1453.94J/0.025mol = -58157.6 J/! mol x 1kJ/1000J = -58.1576 *It is damaging because the reaction is exothermal subject matter that since the temperature in the calorimeter increases, heat/energy is released so value is negative because energy is lost. Conclusions: Within acid-base reactions, we can reason out that the reaction is commonly exothermic. They...If you want to get a dear essay, order it on our website: OrderCustomPaper.com

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