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calculatii volumul solutiei de HNO3 de concentratie 2M care reactioneaza stoechiometric cu 1,92g cupru?  

Răspuns :

niu = md/M
M Cu= 64
niu=1.92/64=0.03 moli
C= niu/V
V=niu/C
V=0.02/2=0.01 l
sper ca te-am ajutat!

3Cu+8HNO3= 3Cu(NO3)2+2NO+4H2O
3X64g....8x63g
1,92g.......x
x=5,04 g HNO3
n=5,04/63=0,08 moli de acid azotic
cM=n/Vs
Vs=0,08/2=0,04L deci se vor folosi 40 ml de solutie de acid azotic