Work done by gas

The answer given is 406 J but I am getting 394.4 J
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iTeachChem Helper
@Gyro Gearloose
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Percy
PercyOP4mo ago
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Percy
PercyOP4mo ago
Sir I feel like my method is correct and I have also rechecked my calculations..so I honestly don't know :(
Cakey Bot
Cakey Bot4mo ago
iteachchem
Transcription requested by Check
Hey Percy, so this difference that's coming out. Why do you think it's just mathematically number? Kewala, what do you think?
iTeachChem
iTeachChem4mo ago
aapne work done ka calc dala hai, dU is the same? Why have you integrated for work done and not used p delta V formula btw?
Percy
PercyOP4mo ago
Since it is not mentioned that the process is isobaric, I decided to integrate because pressure varies with x.
iTeachChem
iTeachChem4mo ago
na it says open to the atmosphere na so we can assume an irreversible process so pf = 80-2l, vf = 20+l, vi = 20, pi = 75+5, this tracks? from this you get l = 10 cm (which gives you the samework done i.e. 108.8 xD)
Percy
PercyOP4mo ago
understood sir But in the answer key it is given work done is 120.4 J....does that mean this answer is incorrect
iTeachChem
iTeachChem4mo ago
must be will wait for other physics folks to check what did you get dU to be? moles you can get from PV/RT right? That x 3/2 R dT
Percy
PercyOP4mo ago
Sir I got delta(U) as 285.6..yes sir I substituted the value of nR from nR = PV/T
iTeachChem
iTeachChem4mo ago
+fsolved
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