Se da:
V(Al+Cl)=12,3l
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m(AlCl3)?
Rezolvare:
2Al+3Cl=2AlCl3
v=V/Vm=12,3/22,4=0,5mol
m=v*M=0,5*(2*133,5)=133,5g
Pr 2:
Se da:
v(HCl)=5mol
------------------
V(H2)?
112l V?
2HCl+Mg=MgCl2+H2
2mol 1mol
V(HCl)=v*Vm=5*22,4=112l
V(H2)=112l * 1mol/2mol=56l
Pr3:
Se da:
V(P+O2)=72,3l
----------------------
m(P2O5)?
4P+5O2=2P2O5
v(P2O5)=V/Vm=72,3l/22,4l/mol=3,2mol
m(P2O5)=v*M=3,2mol*4(16*4+30*2)=4864 g=4,864 kg
*v=cantitatea de subs.
V=volumul
M=masa molara