Question

Cate grame si cate molecule reprezinta 3 moli de hidroxid de aluminiu

Answer 1

3 moli Al(OH)3

Se calculeaza masa mleculara M
M=27+3.16+3=78

nr. moli=n=m: M                          M-masa moleculara , m-cantitatea de subst.

m=n.M
m=3.78=234 g Al(OH)3
                                                23         
78 g Al( OH)3-----------6,023.10    molecule
234 g--------------------------z
                        23
z=234.6,023 .10  molecule