Răspuns:
Explicație:
2.
MH2O= 2 +16=18-------> 18g/moli
MAl2(SO4)3= 2.27 + 3.32 + 12.16=342-------> 342g/moli
MZnCl2= 65 + 2.35,5=136------> 136g/moli
3.
NH3
M= 14 +3=17------> 17g/moli
17g NH3-------14g N -------3 g H
100g--------------x-----------------y
x= 100.14 : 17=82,35% N
y= 100.3 :17=17,65% H
MCaSO4 =40 + 32 +4.16=136-----> 136g/moli
136g CaSO4---------40g Ca--------32gS---------64g O
100g----------------------x-------------------y----------------z
x= 100.40: 136=29,41% Ca
y= 100.32:136=23,53%S
z= 100.64 : 136=47,06% O
