Hello,
Dr. Lavelle went over a question in class last week that said "an exothermic reaction occurs an open beaker producing a net 8 moles of gas at 25 C. What is the change in internal energy?"
How do we know that this reaction is occurring under conditions of constant pressure?
Thanks!
Constant Pressure/Volume
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Re: Constant Pressure/Volume
Hi, I just checked my notes and i wrote "assume P=1 atm, use PV=nRT), meaning the pressure is constant at 1 atm. Maybe he only said this verbally or something and it wasn't on the slides and you might have missed it? I hope this helps!
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Re: Constant Pressure/Volume
Also, the pressure has to be constant in an open beaker because the pressure in the beaker would equal the atmospheric pressure, which is constant.
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Re: Constant Pressure/Volume
If the pressure is not stated, it is assumed to be 1 atm. So in this case, it is assumed that the pressure is constant at 1 atm.
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Re: Constant Pressure/Volume
So if pressure is not given, can we assume that it will remain constant at 1 atm?
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Re: Constant Pressure/Volume
If the reaction is taking place in an open beaker, pressure will be constant
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