Question

how is change in internal energy zero in an isothermal reversible expansion of gas?

Answer 1

@JFraser @samigupta8 @imqwerty

Answer 2

also why is the internal energy dependent on temperature..?

Answer 3

@baru @ParthKohli @rvc @mayankdevnani

Answer 4

@Abhisar @iGreen

Answer 5

Bcz ∆U=nCv∆T

Answer 6

but this is only when work is zero right..?

Answer 7

Nope ..it"zz a general equation for change in internal energy

Answer 8

but.. delta U = q +W and q=Cdelta T right?

Answer 9

Yup. ..bt don't confuse C vid Cv

Answer 10

oh..what is the diff.. i forgot..

Answer 11

C is molar heat capCity ....
N Cv is heat capacity at const.volume

Answer 12

how do we derive this eq..?

Answer 13

I don't know d derivation

Answer 14

Sorry. ...

Answer 15

oh..its ok..but does this hold true always..

Answer 16

@samigupta8 ?

Answer 17

?

Answer 18

Yess it is d general formula

Answer 19

It hold true in oll cases

Answer 20

ok..i think i forgot.. but isn't Cv a special case of C?

Answer 21

Yes i told u at constant volune

Answer 22

so..i was right work done is zero here coz const. volume..we must have used that to derive this..thanks..

Answer 23

hey i have a small doubt..

Answer 24

Yes

Answer 25

Wt is d doubt

Answer 26

what is \[\Delta n g\] for formation of CO? is it 1/2 or 1 ?

Answer 27

it seems both r correct..?

Answer 28

U need to describe d equation for dat

Answer 29

It can be anything ...bcz it depnds on stoichiometric coefficients present in front of d reactants n producrs

Answer 30

no..it was asked just like that..i mean we needed to use this value in the problem..and both are given in the options..(i mean both ways....)

Answer 31

what to do? which to choose?

Answer 32

@Rushwr @rvc can u help here?

Answer 33

what is
Δng
for formation of CO? is it 1/2 or 1 ?

Answer 34

\[\Delta n _{g}\] = no of moles of gaseous products - reactants

Answer 35

i am asking what will be this quantity's values for the formation of carbon monoxide..we must write the eq balance and then find out... but it seems to me that 2 values are correct..thats why i m asking...

Answer 36

thats not my Q... i have asked another Q abv

Answer 37

Δng
= no of moles of gaseous products - reactants
i am asking what will be this quantity's values for the formation of carbon monoxide..we must write the eq balance and then find out... but it seems to me that 2 values are correct..thats why i m asking...

Answer 38

ok i will..wait..

Answer 39

Remember this is only true in case of an Ideal gas

Answer 40

Change in internal energy for an ideal gas depends only upon temperature and hence for an Isothermal change change in internal energy is 0 for an ideal gas.