Răspuns:
date necesare
A,Zn=65g/mol
miu,H2= 2g/mol
1mol.........................................1mol sau, in grame
Zn + 2HCl-----> ZnCl2 + H2↑
65g..........................................2g
x............................................1,5g
x-m=48,75gZn
Explicație: