冷例2:在373k,100kpa压强下,UF6(密度最大的一种气体) 的密度是多少?是H2的多少倍? 解:由PV=nRT==>PV=MR ==> PM= RT=PRt 冷∴p=PMRT=100×103Pa×352×1031(8314×373) =11.4(Kgm3) (M(UF6)=352g/mol) p(H2)=100×103×2.02×103/(8.314×373) =0.0651(Kgm3)(M(H2)=202gmo ∴p(UF6)p(H2)=1140.0651=175倍❖ 例2:在373k,100kpa压强下,UF6 (密度最大的一种气体) 的密度是多少？是H2的多少倍？ ❖ 解：由PV=nRT ==> PV= ❖ ==> PM= =ρRt ❖ ∴ ρ=PM/RT=100×103Pa×352×10-3 /(8.314×373) ❖ =11.4(Kgm-3 ) (M(UF6 )=352g/mol) ❖ ρ(H2 ) =100×103×2.02×10-3 /(8.314×373) ❖ =0.0651(Kgm-3 ) (M(H2 ) =2.02g/mol) ❖ ∴ ρ (UF6 )/ ρ(H2 ) =11.4/0.0651= 175倍 RT M W RT V W