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### Topic: HELP, ENERGY , plz plz plz help  (Read 1723 times)

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#### VHAHAHA

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##### HELP, ENERGY , plz plz plz help
« on: October 02, 2012, 06:38:14 AM »
I really don't know how to do this question
i don't understand what this question is asking
a) i think the amount of heat released is same as heat of formation of H2O = 285.9 kJ mol but i think i am wrong
b) i don't know how to calculate the electrical work, Is it related to free energy?
c) omg, heat again, same ans ? =(

plz help me ><
questions
http://postimage.org/image/jfb6oz0dn/
http://postimage.org/image/yv20id45j/
« Last Edit: October 03, 2012, 12:11:01 PM by Arkcon »

#### VHAHAHA

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##### Homework: entropy , heat release ?
« Reply #1 on: October 03, 2012, 11:56:33 AM »
http://postimage.org/image/jfb6oz0dn/
http://postimage.org/image/yv20id45j/

Question 4 is not the question which i don't understand, only question 3
Question 3 is a energy question, but i found it is quiet tricky

part a) I think the equation for direct combustion is 1/2 O2(g) + H2(g) --> H2O (l) which is same as the equation for the "heat of formation of water", it is -285.9kJ mo1-1 ?
part b) non expansion work = change of G ? i really don't know as my professor didn't tell us, but i found some data on the internet said it is true.

part c) amount of heat released ? is it the same as part a? both are the heat released

and also pleases del my old post , thank you

#### Vidya

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##### Re: HELP, ENERGY , plz plz plz help
« Reply #2 on: October 04, 2012, 08:06:56 AM »
ΔG0 is the work done here
and I also feel that heat released will be same as in a part