calculez masa si moli de Zn pur ,cu p= 90%
p=m,px100/m,i---> 90= m,px100/214,5---> m,p= 193g
niu= m/M= 193g/65g/mol= 2,97molZn
deduc din ecuatia chimica moli HCl, mol H2 , mol sare
1mol....2mol.......2mol.........2mol
Zn + 2HCl-------> ZnCl2 + H2
2,97g.......x...........y...........z
x= 5,94molHCl
y=z=2,97mol
a) m,HCl= niuxM= 5,94molx36,5g/mol=216,8 g HCl
,deoarece M,HCl=36,5g/mol
acesta este masa dizolvata, md, in solutie-> calculez ms
c=mdx100/ms---> ms= 216,8x100/10g= 2168g sol.
b)V= niuxVm= 2,97x22,4 l=........................calculeaza
Vm este volumul molar
c) 2,97mol ZnCl2