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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Shweta Thakur posted an Question
September 27, 2020 • 02:15 am
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30 points
30 points
- IIT JAM
- Chemistry (CY)
Please check the value of cv for triatomic gas i think it should be 9 /2 r... ional degrees or iree- om cach of which contrnbutes energy -r
aluy ncaku tha e temperature, contnibution by vibrational motion is negligible but it has two rotational degrees or Iree- om cach of which contrnbutes energy -RT, Hence, total internal energy (U) =3xRT +2xRT =5RT and - CC+R-R+R =R Hence- 1-49 Similarly for triatomic gas, C = 5R and C, =5R (9/2) R- 130 (7/2) R The values of C C C- C, and y for a few gases at 15°C are listed in Table 1.1. TABLE 1.1. Heat capacities of some gases at 15°C (in cal degree mor Gas Ar 500 3-01 1-99 166 He 4-99 3-00 1-99 166 cO 6-94 4-95 1-99 1-40 H2 6-83 484 1-99 1-41 O 6-96 4-97 1-99 1-40 CO &75 671 2:04 1-30 HS 863 6-54 2-09 1-32 SO 971 7-53 2-18 1-29 CH 9-97 7-91 2-06 1-26 CH 10-07 8-01 2-06 1-26 CH l160 951 2-09 1-22 1.13. 30ULES LAW Thic law deals with the study of variation of internal cnciBy OLd gas with volume at constant temnernts.
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Priyanshu kumar Best Answer
For triatomic gas Cv=7/2R and Cp=9/2R For triatomic gas Accessible d.o.f at lower T =7 So internal energy= 7/2 nRT and Cv=7/2nR
lower temp pe to sir 5 dof hogi
I have sent you one more page
check that
also
wait
sir m sending u
sir this is the case for liner triatomic
linear***
This is the case....but we check only for accessible d.o.f for calculation of molar heat capacities
for linear as well as non linear triatomic gases accessible dof is 7
why and how
this is a general case ??
for this we go for deeply in spectroscopy part so we have to learn only accessible dof for molar heat capacity calculation
check this for reference
🙂thanku sir
welcome😊👍
Jo ye inbox Kiya hua hain usne vibration ki contribution kt Hoti jai
not getting?
....I have written my doubt in this only plz check it and previous page also
This is the general formula 3N-5 and 3N-6..but deviation arises when we access vibrational degree of freedom...
mere second question Ka answer??
I have written on the page
here
sir
ok
sir just check it once
this I got it
but sir vibration to TB consider krte hain n kB high temp hota
Aapne Jo page bheja usme low temp likha
aur ye abhi Jo bheja plz check this
galat likhi ho tm...dekho addition wrong hai
directly consider kro each molecular contributes 1/2kT
vibrational motions contributes 2×1/2kT=kT since both kinetic and potential modes is present
aur sir low temperature vala
vibrating motion sirf high tem pe exist ktta
haa accessible hota ...deeply you will study in physical spectroscopy part
ok
sir
sir