Răspuns:
Explicație:
a.
1mol CaCl2 ---------6,023.10²³molecule
2moli---------------------------x
x= 2 . 6,023.10²³=12,046 .10²³molecule CaCl2
8.
1mol H2O----------6,023.10²³molecule H2O
0,05 moli------------------y
y= 0,05 . 6,023.10²³=0,30115 .10²³molecule H2O