Răspuns:
Explicație:
NH3
M= 14 + 3=17---> 17g/moli
17g NH3---------------3gH
100g-----------------------x
x= 100.3 : 17= 17,65% H
HCl
M= 1 + 35,5=36,5----> 36,5g/moli
36,5gHCl----------------1gH
100-------------------------y
y= 100 : 36,5=2,74% H
H2O
M= 2 + 16=18---> 18g/moli
18g H2O---------2gH
100-------------------z
z= 100.2 : 18= 11,11% H