Specific heat capacity of gas at constant volume

The sources are:

Note: 1 J = 1 W.s

Symbol
$c_{v,gas}$
Unit
J/(kg.K)
Formulae
$\frac{3}{2} R_{gas}$Monoatomic ideal gas
$\frac{5}{2} R_{gas}$Diatomic molecule gas
$\frac{6}{2} R_{gas}$Polyatomic molecule gas
Related
$R_{gas}$
Used in
$\lambda_{gas}$
Choices
GasFormula0°C15°C25°C50°C75°C100°C
Air78%N2+21%O2+minor717.09717.61718.03755.69760.04764.48
N2N2742.91743.01743.16743.64744.45745.66
SF6SF6566.95592.71609.08646.92681.12711.64
CO2CO2632.02647.38657.49682.15705.75728.18
COCO743.16743.45743.7744.63746.03747.97
O2O2655.21657.02658.46662.7667.89673.92
H2H210070.410140.910179.6102531030210333
NH3NH31642.11640.71644.81666.41699.11738.6
SO2SO2516.14512.3512.46518.07527.61538.85
HeHe3116.03116.03116.03116.03116.03116.0
ArAr312.43312.41312.38312.35312.33312.31
KrKr149.11149.05149.02148.98148.95148.92
XeXe95.65195.51495.44595.31295.22795.17
NeNe618.14618.14618.09618.13618.13618.12