Predict the sign for delta Ssys CH3CH2CH3(g) +5O2(g)-> 3CO2(g) + 4H2

  • Thread starter Jbreezy
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  • #1
Jbreezy
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predict the sign for delta Ssys CH3CH2CH3(g) +5O2(g)---> 3CO2(g) + 4H2

Homework Statement



predict the sign for delta Ssys CH3CH2CH3(g) +5O2(g)---> 3CO2(g) + 4H20(l)


The same question for N205(g) --> NO2(g) + NO3(g)

Homework Equations





The Attempt at a Solution



I said the first was negative because it is combustion rxn and is more stable after the rxn.

The second one I said positive because now you have more molecules?

Good or no? Thanks
 

Answers and Replies

  • #2
TeethWhitener
Science Advisor
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You're looking for a change in entropy. In general, the system with a larger number of moles of gaseous molecules has the higher entropy.
 

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