Răspuns:
a. niu=m/miu=71g/71g/mol= 1mol
b. miu= 98g/mol Cu(OH)2 niu=m/miu= 49/98mol= 0,5mol
N=niux/N,A= 0,5x6.022x10²³=3,01x10²³molecule
c. miu=17g/molNH3
1mol NH3..........6,023X10²³molec................17g
12,04x10²³molec...............x
x=m=34g
xplicație: