Question

cate grame de sare se obtin in urma reactiei cuprului cu 200 g solutie acid azotic de C=63%

Answer 1

                        126 g          x g
             3 Cu +8HNO3 =3Cu(NO3)2 +2NO +4H2O
                        8.63       3.188 g


x=126.3.188:8.63=141 g Cu(NO3)2



Intr-o reactie chimica , dintr-o solutie , reactioneaza numai   md.

c=md.100:ms
md=c.ms:100
md=200.63:100=126 g HNO3


MHNO3=1+14+3.16=63
Msare=64+2.14+6.16=188