Consider the oxidation of elemental cadmium (II) oxide.  2Cd(s)+O2 (g)--> 2CdO(s)  Using the following thermochemical data, calculate the minimu temperature in degrees Celsius at which this reaction is spontaneous.  Species  delta Hf degrees (kJ/mol)  S degrees (J/molxK) Cd(s) 0 51.8 O2 0 205.2 CdO(s) -258.4 54.8 Select the correct answer: a. 2594 degrees Celsius b. 2321 degrees Celsius  c. 1.278 degrees Celsius  d. -271.9 degrees Celsius  e. -270.6 degrees Celsius

3. Calculate the value of ΔSo for the formation of POCl3 from its constituent elements, as shown below. P2(g) + O2(g) + 3Cl2(g) → 2POCl3(g)

For a particular reaction at 150.5 °C, AG = –392.62 kJ/mol, and AS = 692.39 J/(mol · K). Calculate AG for this reaction at -0.4 °C. - AG = kJ/mol 80 DII DD F3 F4 F7 FB F9 F10 F12 %24 & 4. 5 6 7 8 Y U H K F.

For a particular reaction at 180.9 °C, AG = 527.78 kJ/mol, and AS = 953.96 J/(mol · K). Calculate AG for this reaction at -3.7 °C. AG = kJ/mol

Consider the decomposition of dinitrogen tetroxide, N2O4, into nitrogen dioxide, NO2.  N2O4 (g)--><-- 2NO2 (g) Using the following thermochemical data, calculate delta G for this reaction at 50.0 degrees Celsius and determine whether it is spontaneous or nonsponaneous.  Species  delta H (kJ/mol) S degrees (J/molxK) N2O4(g)  11.1 304.4 NO2 (g) 33.2 240.1

Consider the reaction A → B with ΔS° = 78.900 J/(K·molrxn). What should be the ΔS° in J/(K·molrxn) for the reaction B → A? Report your answer to three decimal places.

Answer this question without using numbers from the book (or anywhere else!) ΔS for the following reaction is negative. True or false?   2 CO(g) + O2(g) → 2 CO2(g)

25°C 32°C bum wohl 891 10 228 1. Two aqueous reactants are mixed in a flask with a balloon over the top and the following change is observed. What are the signs on q and w for the system? Enter >, <, or in each box below. W 0 2. You drop a piece of potassium metal into water and the following exothermic reaction occurs: 2 K(s) + 2 H₂O(l) → 2 KOH(aq) + H₂(g) What are the signs on q and w for this reaction, at constant temperature and pressure? A) q is positive and w is negative. B) q is negative and w is positive. C) q and w are both negative. D) q and w are both positive. E) There is not enough information given. 3. What is the change in internal energy when one mole of helium gas in a flexible-walled container at STP is heated to 100°C? (CHe(g) = 5.30 J/g°C) AU =