For the process CaCO₃(calcite)→ CaCO₃(aragonite)ΔH° = -0.21 kJ,ΔS° = -4.2 J/K Assuming that the surroundings can be considered a large heat reservoir at 25°C,calculate ΔS_surr and ΔS_total for the process at 25°C and 1 atm pressure.Is the process spontaneous at 25°C and 1 atm pressure?

Question

Quizplus · Accepted Answer

ΔS_surr is calculated using ΔH/T = -0.21 kJ / 298 K = -0.0007 kJ/K = -0.7 J/K. ΔS_total = ΔS_system + ΔS_surr = -4.2 J/K - 0.7 J/K = -4.9 J/K. Since ΔS_total is negative, the process is not spontaneous.

For the Process CaCO3(calcite)→ CaCO3(aragonite)ΔH° = -0

For the Process CaCO₃(calcite)→ CaCO₃(aragonite)ΔH° = -0