1mol 1mol 2mol
2 at. 2at, 2(1atH+1atCl)
H2 + Cl2---> 2HCl
numarul de atomi de hidrogen, ca si cel de clor, se conserva in timpul reactiei----> cati intra in reactie, atatia rezulta
Se mai stie ca 1 mol de gaz ,H2,Cl2,HCl, contin cate 6,023x10²³molecule-->
1molH2 contine 2x6,023x10²³at
1mol Cl2............2x6,023x10²³at
2molHCl..............2(6,023x10²³ atH+6,023X10²³atCl)