Răspuns:
Explicație:
-se afla masa molara a NaOH
M= 23+16+1=40--------> 40g/moli
40 g NaOH---------23 g Na
2000g -------------------x
x= 2000 . 23 : 40 = g Na
n= 1150g : 23g/moli = 50 moli Na
masa molara NaOH=23+16+1=40
2kg=2000g
40g NaOH..........23gNa
2000gNaOH.......x
x=2000×23/40=1150g
nr moli=1150/23=50 moli