m气体质量,V气体体积,Vm气体摩尔体积,ρ气体密度
m = ρ*V
V = n*Vm
代入得m = ρ*n*Vm
将n(物质的量)除到左边得
m/n = ρ*Vm
即 M = ρ*Vm
当标准状况时,M = ρ标 * 22.4L/mol