Răspuns:
5.a. SiCl4
rrat.Si:Cl=1:4
r.m. Si:Cl=28:142=14:71
b) KClO3
r.at.K:Cl:O=1:1:3
R.m.K:Cl:O=38;35,5:48
c). SO2
MSO2=32+2×16=64g/mol
64SO2g...........32gS..........32gO
100gSO2...........xgS...............ygO
x=100×32/64=calculează
y=100×32/64=calculează