se stie ca
1mol de atomi contine N,A atomi ( numarul lui Avogadro) =6,023x1o²³atomi
a. 1mol Fe......,,,contine N,A atomi
x........................18,066x10²³at
x=n(niu)= 18,066x10²³/6,023x10²³=3mol atomiFe
b. C + O2----> CO2
1moLC..reactioneaza cu 2mol atomi O sau
N,A (C).at/mol..........................2mol(O)
12,044x10²³.atC........x=n=24,088x10²³/ 6,023x10²³ mol =4mol O= 2molO2
c. 1mol molec.HCl...........1mol atomiH.........1mol atomiCl
1mol molecHCl...........N,A(H).at.......................N,A(Cl)atl
3000mol................................x............................................y
calculeaza x y, inlocuind N,A !
C. MSO3= (32gS+3x16gO)/mol= 60g/mol
in 60g SO3..............3N,A atomi O
0,8g...................X=
