Question

Enthalpy of Hydration: Data Sheet Show all your work clearly and include appropriate units A: Dissolution of Anhydrous Sodium Acetate Name . 8142 lo g . 235 11-35 aa.3 Mass of water Mass of NaC,H302 Mass of solution Room Temperature Final Temperature Specific heat capacity of the solution 4.18VeC Calculations for q soution q solution d reaction B. Dissolution of Sodium Acetate Trihydrate cigh bot 1.412 Mass of water Mass of NaC2H3O 3H2O Mass of solution Room Temperature Final Te AT Specific heat capacity of the solution Calculations for quson 1 d rature 4.18 Mgoc q reaction Report Page 1 of 3 Enthalpy of Hydration: Post Lab Questions Name Show all your work and include appropriate units Q1. Calculate moles of NaC,H,O, (s), then use Greaertin to calculate aHrestion for anhydrous sodium acetate in kilojoules. NaC,H,02 (s) → Na.(aq) + C2H,02(aa) .ols1 mo! then use geaction to calculate ΔHeaction for sodium acetate trihydrate in kilojoules o 5mo260/ 10 00 260 31.07 17:45 K İMol Q3. Use Hess' Law and the results from questions 1 and 2 to find the enthalpy of hydration (AHuructon) for anhydrous sodium acetate in k. Show your work clearly-rewrite transformed reaction steps from questions 1 and 2 above. Report Page 2 of 3 Enthalpy of Hydration: Post Lab Questions Name Q4. Another way to calculate AH values that cannot be measured experimentally is with standard heats of formation. a) Using the&Hr values provided, calculate&H-n for NaC,H,O,(s) +3H20(1) → NaC,H,oǐ3H,0(s) with the equation: dHn. Σ np ΔΗ,o(products)-Σ n' ΔΗ.o(reactants) AH (kJ/mol) 708.8 - 1604 285.8 703.8 3(.5 NaC H 02(s) 357.1 705.8)(257.) H,OU b) Compare your value from 4a) to your experimentally determined value in Q3. Determine the percent error. Q5. Use the standard reaction enthalpies given below to determine AH rxn for the following reaction. Show your work in detail. Findi Given: CH, t202 ? 2CHa + 2 O2 →CH.co + 3H。аН"m ΔΗ.rxn -981.1 kJ ан.rxn®-802.3 k CO2 + 2 H2O Report Page 3 of 3

Answer 1

108 235 22.3 25.to 3-4 C Eine L-th.aonatot ee T n.i 1-3329- AT- 52c

235 82 1,0 :992 136 223 0145

ナ 0 2-0 20

34- си 648リ 丁 633