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Q.

If the standard enthalpy change ΔrH For a certain reaction at 298 K and constant pressure is 1860kJmol1 , the standard entropy change ΔsysSθ of the same reaction is 550JK1mol1, which one of the following statements is correct? 

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a

Δsys S+ΔΔsurr S=+5692Jmol1K1,the reaction is spontaneous

b

Δsys S+ΔΔsurr Sθ=5692Jmol1K1, the reaction is non- spontaneous

c

Δsys Sθ+Δsurr Sθ=7692Jmol1K1, the reaction is spontaneous

d

Δsys Sθ+ΔΔsurr  Sθ=+7692Jmol1K1, the reaction is non- spontaneous

answer is C.

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Detailed Solution

Ssurrounding =-Ssys=-HsysT =--1860×1000298=6241.61JK-1mol-1

Stotal=Ssys+Ssurrrounding =-550+6241.61=5691.615692J/K/mol

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If the standard enthalpy change ΔrH⊖ For a certain reaction at 298 K and constant pressure is −1860kJmol−1 , the standard entropy change ΔsysSθ of the same reaction is −550JK−1mol−1, which one of the following statements is correct?