Homework Help: chemistry

Posted by Jerry on Wednesday, March 14, 2012 at 6:38pm.

Which of the following reactions have a positive ΔSrxn? Check all that apply.

A(g) +B(g) -----> 3C(g)
A(g)+ B(g)------> C(g)
2A (g) +2B (g)-----> 3C(g)
A(s)+B(s)------> C(g)

I picked the first one and it marked me wrong.
Please help(:

chemistry - DrBob222, Wednesday, March 14, 2012 at 11:25pm
1 and 4 should do it.
1, I suspect for the same reason you picked it. 4 because A and B are SOLIDS; therefore, converting them to a gas certainly would be a positive dS.
chemistry - Jerry, Wednesday, March 14, 2012 at 11:48pm
Yes it is correct! Thanks :)
chemistry - Andrew, Sunday, November 25, 2012 at 2:27pm
I had similar problem, except correct choices were 2A(g)+B(s)->3C(g) and A(g)+B(g)->3C. Just wanted to thank Dr.Bob for explaining how it actually works.

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