Question

A diatomic ideal gas is expanded according to PV​3= constant . Calculate the molar heat capacity of gas ( in cal/mol) this process . ( use Cv,m = 5/2R)

Answer 1

this is a polytropic process.... in which alpha =3 .. so the formula for finding molar heat capacity is
C=Cv +( R/1-alpha)
C =
$(5 \div 2) +( 1 \div 1 - 3)$ ×R
C =
$(5 \div 2) - (1 \div 2)$ ×R
C =
$4 \div 2$ ×R
C=2×R