-calculez masa de HCl ce intra in reactie
c/100= md/ms; 18,25/100= m/600----> mHCl= 109,5g
moliHCl= m/M=> 109,5g/36,5g/mol= 3mol
- calculez masa de Zn si HCl care reactioneaza pentru a obtine 1 molH2 1mol....2mol 1mol
Zn + 2HCl-----.> Zn Cl2+ H2
65g.........2x36,5g...................1mol
m,Zn= 65g---------------> mCu= 200-65g= 135gCu
-calculez excesul de HCl
m=109,5-2x36,5g=36,5gHCL
-calculez masa de carbonat de sodiu care reactioneaza cu aceasta masa de acid
2HCl + Na2CO3----> 2NaCl + CO2 + H2O
2X36,5g.......106g
36,5g...........m= 53g
-calculez masa de solutie care care are md=53g
40/100= 53/ms------------------------> calculeaza ms!!!!!
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