Homework Answers
STP refers to standard temperature & pressure.
At STP
Temperature = 25 degree celsius
Pressure = 1 atm
Cp = 4.2 J /g degree celsius
Entropy can be calculated by using the formula
S = n Cp ln T
For initial entropy,
T1 = 25 degree celsius
S1 = 1 * 4.2 * 2.303 log 25 = 13.522 J/degree celsisus
For final entropy
T2 = 125 degree celsisus
S2 = 1 * 4.2 * 2.303 log 125 = 20.283J/degree celsius
Change in entropy = S2 - S1 = 20.283 - 13.522 = 6.761 J/degree celsisus
or change in entropy can be calculated by using the direct formula
= n Cp 2.303 log (T2/T1)
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