Chemistry help!!?? Please show work so I know how to do it on my own!!

Chemistry
Tutor: None Selected Time limit: 1 Day

If I have 45.0 grams of carbon in one pile and 60.0 grams of carbon in the other, which sample of carbon has more entropy?

 

If a reaction is endothermic and has a positive ΔS, what should you do to the temperature in order to make sure the reaction will run?

 

Use bond energies to determine the ΔH for the combustion of methane (CH4). 

 Please show work so I know how to do it on my own, thanks!

Mar 26th, 2015

The larger pile (60 grams) would have more entropy.  Entropy is essentially disorder, if you have a larger amount of atoms there's more possible ways that the atoms can be spread around within the pile.  Larger possibilities of configurations means more disorder.

delG=delH - delST  :  Spontaneous reactions have a negative delG, you are given that the reaction is endothermic (positive delH) and has a positive delS.  With that being said it's simple algebra.  High temperatures will make a negative delG more positive.

CH4(g) + 2O2(g) --> CO2(g) + 2H2O(l)

 
[-393.5 + 2(-285.8)] - [ -74.9 + 0] 
= -965.1 + 74.9 

= -890.2 kj/mole 

Mar 26th, 2015

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