Question

1) For the process

CaCO3(calcite)? CaCO3(aragonite)?H°= -0.21 kJ, ?S°= -4.2 J/K

Assuming that the surroundings can be considered a large heatreservoir at 25°C, calculate ?Ssurrand ?Stotalforthe process at 25°C and 1 atm pressure. Is the process spontaneousat 25°C and 1 atm pressure?

Use the data in Appendix B to calculate Delta S Delta S and Delta S at 25 degree C for the reaction; 4 NH3(s) + 5 O2(g) rightarrow 4 NO(s) + 6 H2O(g) Is the reaction spontaneous or nonspontaneous? Explain For the reaction below Delta H degree = + 92.2 kJ, and Delta S degree = + 198.7 J/K. Estimate the temperature (in Kelvin) at which this reaction becomes spontaneous. [Hint: Determine the value of Delta G degree first] 2 NH3(g) rightarrow N2(g) + 3 H2(g)