MH2=2AH=2*1=2g/mol
mH2=10g
n=m/M=10/2=5 moli H2
n=V/Vm=>V=n*Vm=5*22,4 =
1 mol H2......................NA=6,023*10^23 molecule
5 moli H2...........................x molecule
x=6,023*5*10^23 molecule
NA - nr lui Avogadro
n(niu) - nr de moli
A - masa atomica
M(miu)-masa molara, g/mol
m - masa, g
V - Volumul, L
Vm - Volmul molar = 22,4L in (c.n)