Question

Cati moli se gasesc in a] 5,6 g de dioxid de calciu b] 980 g de acid sulfuric
c] 3,6 kg apa d] a56 g de hidroxid de aluminiu

Answer 1

Răspuns:

Explicație:

n= m : M            n=nr.moli  ;     m=masa substantei  ;    M=masa molara

MCaO= 40 + 16= 56------> 56g/moli

n= 5,6g : 56g/moli=0,1 moli CaO

MH2SO4= 2 + 32 + 4.16 =98-----> 98g/moli

n= 980g : 98g/moli = 10 moli H2SO4

MH2O=2 +16=18-------> 18g/moli

3,6kg=3600 g H2O

n= 3600g : 18g/moli=200 moli

MAl(OH)3 = 27 + 3.16 + 3=78------> 78g/moli

n= 56g : 78g/moli=0,72 moli Al(OH)3