Question

1. Calculati cantitatea de sodiu, Na, continuta in 2 Kg hidroxid de sodiu,
NaOH?
Ana =23, A.= 16, AH = 1​

Answer 1

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

Answer 2

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