Chem 112 SP 2011 Homework 7 15 pointsName ___________________________DUE TUESDAY, APRIL 26 BY 5 PM. Show work for partial credit. No credit will be awarded if no work is shown or if the work does not lead to the answer shown.1. (0.9 pts) Without doing any calculation, predict the sign of ∆S for the following reactions. Circle the sign appropriate for each reaction.a) Mg(s) + Cl2(g) →MgCl2(s) ∆S is: (+) (-) 0b) 2 H2S(g) + 3O2(g) →2 H2O(g) + 2 SO2(g) ∆S is: (+) (-) 0c) NH4Cl (s) →HCl(g) + NH3(g) ∆S is: (+) (-) 02. (1 pt) For a certain reaction, ∆Horxn= -95 kJ; ∆Sorxn = -157 J/K; T = 298 K. Calculate ∆Suniverseand predict whether or not the reaction is spontaneous at the temperature. ∆Suniv= (0.3 pt) At this temperature, the reaction is (circle one) spontaneous non-spontaneous3. (a) (1 pts) Calculate the free energy change for the reaction below at 25 oC and indicate whether or not it is spontaneous. 2 Ca(s) + O2(g) →2 CaO(s) ∆Horxn= -1269.8 kJ; ∆Sorxn = -364.6 J/K(b) (0.3 pts) The reaction is: (circle one) spontaneousnon-spontaneous1
4. (0.9 pts) For each reaction below, predict the conditions under which it is spontaneous.