Question

Cati atomi se gasesc in 10g H,He,Li,Na,K,P,Hg,Cl,I,Br,N?

Va rog ajutor!

Answer 1

M, H=1g/mol

n=m/M=10/1=10

10×6.023×10^23=60.23×10^23atomi H

M, He=2g/mol

n=10/2=5 mole He

5×6.023×10^23=30.115×10^23 atomi He

M, Li=3g/mol

n=10/3=3.3 mol

3.3x6.023×10^23= atomi Li

...

Answer 2

1mol  hidrogen---------2.6,023.10²³ atomi H                      n=m:M=10g:2g/moli=5moli                                                                   1mol hidrogen----------------2.6,023.10²³ atomi H    

5moli-----------------------------------x

x=2.5.6,023 .10²³ atomi H

10g Na

n=m:M =10g : 23g/moli

           =0,43 moli Na

1mol Na----------6,023 .10²³ atomi Na

0,43 moli-------------y

y=0,43 .6,023.10²³atomi Na

10 g Clor                   MCl2=2.35,5=71----->1mol=71g

n=m:M=10g : 71g/mol=0,14 moli clor

1mol clor ----------2.6.023 .10²³atomi clor

0,14 moli--------------------z

z=2.0,14 .6,023.10²³atomi Cl

[ restul de atomi lucreaza dupa model]                                                daca ai nelamuriri scrie!