Thermochemistry

Rodaan Peralta-Rabang

Partners: Doug Brown and Griffin Keeler

October 26, 2009

Instructor: Dr. Goldman

T.A.: Omar

Course: CH119

Thermochemistry: Abbreviated testing ground Report
Reaction # Reaction Type DH (J) Moles of one 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 Dissolution 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 capacity 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 exothermic 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 conclude that the reaction is commonly exothermic. They...If you want to get a full essay, order it on our website: Orderessay



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