 # Assignment # 1 Hvap water = 40.7 KJ/mol Hfus water = 6.01 KJ/mol ...

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Assignment # 1 Hvap water = 40.7 KJ/mol Hfus water = 6.01 KJ/mol Solid Cwater = 2.03 J/g°C Liquid Cwater =4. 184 J/g°C Gas Cwater = 2.01 J/g°C 1. How much heat is in the process of condensing 305 g of liquid water to solid ice? 2. If 447 g of water at 75.9 °C loses 8750 J of heat, what is the final temperature of the water? 3. Calculate AG for each of the process and state if the process is spontaneous or nonspontaneous if you are given the following information: AH- 145 kJ, T- 293 K, AS- 195 J/k Gibbs Free Energy S 4. A 3.51 g sample of an unknown substance at 976 °C is heated to steam at 2620 °C. How much heat is absorbed? The unknown substance melts at 968 °C, and boils at 2255 °C. Molar mass of the substance is 115g/mol. (q-mcAT) Csubstance (solid) 0.235 J/g°C Csubstance (liquid) 0.290 J/g°C Csubstance(sas) 0.245 J/g°C AHnus 11.2 kJ/mol AHvap 255 kJ/mol 5. Find AH° for the reaction 2H2(g) + 2C(s) + O2(g) --> C2HsOH(I) using the following thermochemical data. C2H5OH (I) +202 (g) --> 2 CO2 (g) + 2H2O (I) AH=-875.kJ C (s) + O2(g) --> CO2 (g) AH=-394.51 kJ H2 AH=-285.8 kJ Assignment # 2 1. Use Le Chatelier's principle to determine where the stress lie, which direction will you shift to relieve the stress, and how will you make the shift happen? 4HCI (g) + O2(g) 2H2O(g + 2Cl2 (g) AH 98 KJ THIS IS NOT A MULTIPLE CHOICE PROBLEM EACH LETTER IS A PROBLEM a) [HCI] is increased b) [H2O] is increased c) [O2] is decreased d) Temp is increased e) Volume decrease f) Pressure decreased 2. Find the pH, pOH, and [H*] of a 4.66 x 10-3 M Ba(OH)2. Hint this is a strong base. 3. Find the pH, pOH, and [OH-] of a 3.21 x 10-2 M HNO3. Hint this is a strong acid. 4. Find the concentration of [CO2], if the Keq = 4.35, [O2] = 0.450, [H20] = 0.751, and [C2He] = 1.23 2C2H8(g) + 702(g) 0 4CO2(g) + 6H2O(g) 5. Label the acid, base, conjugate acid, and conjugate base pairs for the following reaction below. HBr (aq) + H20 (I) Br- (aq) + H304 (aq)

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