[حـآيـس]

قانون الكثافة : d=P.MWt/Rt

R=0.082
M.Wt=Molculer weight
P=Pressure
T=Temp in Kelven (C+273)

dhcl=1*36.5/0.082*(25+273)=1.49
dch4=1*16/0.082*(25+273)=0.65
dcl2=1*71/0.082*(25+273)=2.9
dnh3=1*17/0.082*(25+273)=0.695-->0.7

lowest D is CH4 with 0.65 - highest is Cl2 with 2.9

ان شاء الله تكون وصلت الفكرة