Question

Calculati:
a) cantitatea de Fe care contine 18,066 x 10²³ atomi
b) cantitatea de O exprimata in moli care reactioneaza cu 12,044 x 10²³ atomi de C
c) nr de atomi care se gasesc in 3 kmoli de HCl
d) nr de atomi de O din 0,8 g trioxid de sulf

Va rog!!!

Answer 1

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=