How to calculate the value of R for finding entropy change if initial and final volume are present and no.of moles are given and temperature is given ?

I am having doubt in this.

Dear Student

For an isothermal process, the formula to find the value of R for finding entropy change ​​​​​​is as follows:

ΔS=dqT=nRV1V2dVV=nRln(V2V1)
V2 is the final volume, V1 is the initial volume, R is gas constant, n is number of moles

Here, the value of entropy change, n, V2, V1 can be put to solve for R.
Regards

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