Need universal gas constante for R-12 :)

[zavodnick]

Hello. I`m a student and I`m just doing my homework from subject Refrigeration, and I must to find out a volume in overheated steam area... To find out that I pressumed that R-12 is ideal gas and I use a formula
p*v=R*T. I have a pressure and temperature but I need universal gas constante for R-12 on p=2,354 bars and
t=-8 C. Thanks