Question

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 25C, calculate ΔSsurr and ΔStotal for the process at 25C and 1 atm pressure. Is the process spontaneous at 25C and 1 atm pressure?
A) ΔSsurr = 4.2 J/K, Δtotal = 0, not spontaneous
B) ΔSsurr = 0.7 J/K, ΔStotal = -3.5 J/K, not spontaneous
C) ΔSsurr = -0.7 J/K, ΔStotal = -4.9 J/K, spontaneous
D) ΔSsurr = -0.7 J/K, ΔStotal = -4.9 J/K, not spontaneous

Answer

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