Question

Stabilirea coeficientilor redox
Pb +HNO3---> Pb(NO3)2+ NO+H2O
Volumul NO=2,24l
Miu V HNO3=?
mPb(NO3)2=?
Vsol HNO3=?
CM=0,1M
H-1, O-16, N-14 , Pb-2017

Answer 1

Pb-2e---> Pb⁺²     ori3--> pui 3Pb   ,3Pb(NO3)2
N⁺⁵  +3e--> N⁺²   ori2---> pui 2NO
-moli NO: n sau niu= V/22,4;   n= 2,24l/22,4l/mol= 0,1mol

          8mol           3mol            2mol
3Pb+8HNO3---> 3Pb(NO3)2+2NO+4H2O
        n=..0,8/2....n=..0,3/2.......0,1mol
m=nxM
m= 0,15mol(207gPb+2x14gN+6X16gO)/mol=...............calculeaza !!!!

c=n/V
0,1=0,4/V...........................calculeaza V(in litri)!!!!!