Chemical Forums
Chemistry Forums for Students => High School Chemistry Forum => Topic started by: Speedystar777 on June 05, 2020, 11:03:43 PM
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I was trying to prove the combined gas law to myself, but ended up with an equation that contradicts Boyle’s Law. What logical fallacies did I make?
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Your algebra is obviously correct. Your problem is in your interpretation of the laws. Remember what each law assumes as an initial condition and how that differs between the laws.
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I think learning by doing one's own derivations is a fine way to proceed, and making mistakes is an important part of the learning process.
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try it like this... we're starting with V1 at constant T and n... and converting it to V'
.. P1V1 = P2V'
then if you start with V' at T1 and P1 and convert it to V2 at constant P and n
.. V' / T1 = V2 / T2
subbing
.. P1V1 = P2 * (T1 * V2 / T2)
you get to rearrange