72 the heat capacity at constànt volume cy of c,n, and asci, in gaseous state are 78.982 jk- mol and 74.83 jk-l mol. (assume all degree of freedom contribute) w

first formula answer is 78, 2nd formula answer is 74

but i don't know how to use this eqn in qs

Total degree of freedom is 3N right Sourav

what is N?

N is total number of atom

Here we have 4 atom in both case right?

yes

So total degree of freedom is 12 right ?

remember 3N

yes

A molecule has translational , rotational & vibrational degree of freedom right ?

yes

So a linear molecule has 3N - 5 degree of freedom & a non - linear molecule has 3N-6 vibrational degree of freedom ?

why the minus 5 and 6

See for linear molecule has translational degree of freedom is 3 & rotational degree of freedom is 2 right

yes

and for non linear they has 3 and 3

Correct Sourav

but my qs is why we are removing translation and rotational dof from total dof

Because in question it is given that all degree of freedom is contributing

yes.. is 3n - 5 and 3n-6 vibrational dof?

Correct Sourav

Now you can solve for Cv

And get the answer

one more thing translation & rotation contribute R/2 & vibrational contribute R

That's all.

Is your problem solved? Or still any Doubt

we will find the vib dof and subtract is from 19 and 18.. then relate the dof to structure?

i got upto 3n - 6 and 3n-5 but then how to proceed im not getting

Cv = (vibration degree of freedom * R) + (5/2 * R) for linear

Cv = (vibration degree of freedom * R) + (6/2 * R) for non-linear

Cv match kar lo given & calculated se structure aa jayega

still doubts then ask?

sir iske previous qs mai humne vib dof nahi liya.. kyun?

See vibrational degree of freedom very very high temperature pe contribute karte. So either temperature mention kiya hua rahega ya to like this question as mentioned all degree of freedom is contributing

got it?

sir one more qs.. im reading material from edncl and solving qs from chem academy.. is it enough for Jam for i need to study chem academy material too

i want to score a seat in Iit

morning i will answer this 🙏😊

im getting f=19 for first one

for 2nd ?

for 2nd one 18

Sorry you can't apply this formula here

Because here it telling all degree of freedom is contributing. So first of all we have to subtract vibrational degree of freedom

Please wait I am solving

please mark this also Sourav 🙏