Question

在标准状况下,二氧化硫和氧气的混合气体500ml,通过灼热的催化剂层后,体积变为450ml(折算成标准状况下).将此45

Answer 1

2SO2 +O2 ==可逆==2SO3

2 1 2

X X/2 X

500-X - X/2 +X=450 X=100mL

m(SO3)=(100mL/22.4L/mol) *80g/mol=0.357g

n(SO3)=0.004464mol

m(SO2)=0.985g-0.357g=0.628g

n(SO2)=0.009813mol

根据硫元素守恒

原来m(SO2)=64g/mol*(0.004464mol+0.009813mol)=0.9137g=0.914g