AP EAMCET Engineering 23 Apr 2019 Shift 1 Paper

The universal gas constant is given by,
R=C′p−C′v
R=mCP−mCV
R=m(Cp−Cv)
Here, C′P and C′V are the molar specific heat of gas at constant pressure and constant volume.
Substituting the values, we get
R=m(620−420)
m=

R

200

Using the ideal gas equation,
pV = nRT
pm = ρRT (As,n=1‌and‌ ‌ρ=

m

V

)
105×

R

200

=ρR(273)
ρ=1.85‌Kg−m−3