Homework Help: Chemistry

Posted by Christina on Monday, November 16, 2009 at 9:03pm.

Calculate S (measure of total entropy) for the following reaction at 25C and 1atm, and tell whether the entropy is increasing or decreasing.
C3H8(g)+5O2(g)-> 3CO2(g)+4H2O(g)
S of C3H8=64.5 cal/(mol*K)
S of O2= 49 cal/(mol*K)
S of CO2= 51.1 cal/(mol*K)
S of H2O= 45.1 cal/(mol*K)

S of the equation is 23.9 and increasing entropy.

I do not know how to factor in the temp. and atm... please help!!!

Chemistry - DrBob222, Monday, November 16, 2009 at 9:30pm
Is this just
Srxn = Sproducts-Sreactants.
And if you look them in a table, that is at 25 C and 1 atm isn't it.

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