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Topic: pV work problem?  (Read 3134 times)

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Offline dkssudgktpdy

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pV work problem?
« on: October 12, 2011, 12:50:10 AM »
50g of liquid water is electrolyzed to generate hydrogen gas and oxygen gas at 298K and 100kPa. What is the total pV work associated with this proocess? (Assume ideal gas behaviour)

Please explain step by step. I am confused..
Thanks!
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Offline Borek

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Re: pV work problem?
« Reply #1 on: October 12, 2011, 02:43:31 AM »
What is formula for work?

Can you write reaction equation?
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Offline dkssudgktpdy

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Re: pV work problem?
« Reply #2 on: October 12, 2011, 02:53:03 AM »
Well the formula for work is W= - pV
and the reaction in this case is:
H2O --> 2H2 + O2

But I don't know how to put things together..
I did my calculation using W = -pV and ideal gas law formula and got -6866J but the answer is -10306J

Please help..
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Offline SABRY

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Re: pV work problem?
« Reply #3 on: October 12, 2011, 10:59:03 PM »
1. From the chemical reaction, can you determine the heat of reaction from the heat of formation of products and reactant?

2. Try the above

3. If still cannot get the right answer, post your detail calculation
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