HMWK 7_SP 2011 - Chem 112 SP 2011 Homework 7 15 points Name DUE TUESDAY APRIL 26 BY 5 PM Show work for partial credit No credit will be awarded if no

HMWK 7_SP 2011 - Chem 112 SP 2011 Homework 7 15 points Name...

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Chem 112 SP 2011 Homework 7 15 points Name ___________________________ 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) + Cl 2 (g) MgCl 2 (s) S is: (+) ( - ) 0 b) 2 H 2 S(g) + 3O 2 (g) 2 H 2 O(g) + 2 SO 2 (g) S is: (+) ( - ) 0 c) NH 4 Cl (s) HCl(g) + NH 3 (g) S is: (+) ( - ) 0 2. (1 pt) For a certain reaction, H o rxn = - 95 kJ; S o rxn = - 157 J/K; T = 298 K. Calculate S universe and predict whether or not the reaction is spontaneous at the temperature. S univ = (0.3 pt) At this temperature, the reaction is (circle one) spontaneous non - spontaneous 3. (a) (1 pts) Calculate the free energy change for the reaction below at 25 o C and indicate whether or not it is spontaneous. 2 Ca(s) + O 2 (g) 2 CaO(s) H o rxn = - 1269.8 kJ; S o rxn = - 364.6 J/K (b) (0.3 pts) The reaction is: (circle one) spontaneous non - spontaneous 1
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4. (0.9 pts) For each reaction below, predict the conditions under which it is spontaneous.
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