Răspuns:
Explicație:
4moli NH3
react. cu 365g sol. HCl , c=20%
subst. in exces
masa NH4Cl
- se afla md sol. HCl
md= c. ms : 100
md= 20 . 365 : 100=73 g HCl
-se afla masa a 4 moli NH3
MNH3= 14 + 3=17 --------> 17g/moli
m= 4moli .17g/moli= 68g NH3
x 73g yg
NH3 + HCl = NH4 Cl
17g 36,5g 53,5 g
x= 17 .73 : 36,5=34g NH3
Deci NH3 este in exces --------> 68 - 34= 34 g NH3 in exces
y=73 . 53,5 : 36,5=107 g NH4Cl
n= 107g : 53,5g/moli= 2 moli NH4Cl
MHCl= 1+ 35,5= 36,5--------> 36,5g/moli
MNH4Cl= 14 + 4 + 35,5=53,5 --------> 53,5 g/moli