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An endothermic reaction occurs in a cylinder with initial volume of 1 L. 5 kJ of heat is transferred and the internal energy change (∆E) is -5 kJ. The only work occurring the expansion or contraction of the cylinder against an external pressure of 1 atm. What is the final Volume of the cylinder? Can anyone help?

 Nov 2, 2018
 #1
avatar+37167 
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Were you given the initial temp of the 1 l volume?  

 Nov 2, 2018
 #2
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no only this question 

 Nov 2, 2018
 #3
avatar+37167 
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Hmmm...I think I am stuck...

   if you add 5kj (or subtract) from a volume...it will change ...according to the gas laws...but if it is 6000 degrees it will change less than if it was 200 degrees.....so I think I need an initial temp.......I could be wrong....was STP stated?

 Nov 3, 2018
 #4
avatar+2234 
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Solution:

 

Translate Joules to Liter-atmospheresw=5000J1Latm101.325J=49.35Latm| Negative (-) means energy entered system.w=PΔVChange in volume ΔV=wP=49.35Latm1atm=+49.35L| Positive (+) means gas expanded. Final Volume of the cylinder 49.35L

 

 

 

 

GA

 Nov 4, 2018

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