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Calculate ∆Ssurr when a reaction having each of the following changes in enthalpy:

a. ∆Hrxn0 = -287 kJ; 298 K.
b. ∆Hrxn0 = 127 kJ; 77 K.

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dSsurr = -(dHrxn/T) = -(287000/298) = ?

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