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## Homework Statement

A mole of nitrogen is heated at constant external pressure of 1 atm from 25° C to 100° C. The heat capacity of nitrogen is 29.1 J/mol·K.

Calculate ΔSsurr

**2. The attempt at a solution**

delta_S=Q/T = -1*29.1*75/373=-5.85 J/K

(heat transferred to the system divided by T_surr which we assume to be equal to T_final)

The solution in my lecture notes says -22 J/K, I can't see where that came from.