d. Reaction 4: Put 1 mL of 0.5 M Ca2+ solution in a test tube. Add 1 mL of 0.5 M

Question

d. Reaction 4: Put 1 mL of 0.5 M Ca2+ solution in a test tube. Add 1 mL of   0.5 M SO4

2– solution and mix.

e.  Reaction 5: Put 1 mL of 0.5 M Na+ solution in a test tube. Add 1 mL of   0.5 M SO4

2– solution and mix

Alt The AG values calculated in this experiment are approximations of AG since the concen AG AGO RT in Q calculate AG for reactions 4 and 5 using the true ion concentrations present after mixing the two solutions. What is the difference between AG and AGo for both reactions? 5. Determine the of AG for following process at 00C: H20(s) H (HINT: No calculations are necessary.) S. Predict the spontaneity of the following reaction at 250C, then at 800°C. AG f NH3(g) -16.40 kJ/mole. 2NH3(g) N2(g) 3H2(g) Laaneet temperature (at constant standard pressure) at which

Explanation / Answer

5) For any process of phase change the change in gibbs free energy is always zero. Hence for given process delta G = 0

6) delta G rxn = delta G prod - delta G react

= (3x0)+(1x0)-(2x-16.4) = 32.8 kJ

Since delta G reaction is positve meaning that the reaction is non-sponteneous.

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