Question

Ajutorrrrrrrr
Dau coroana

Answer 1

Răspuns:

Explicație:

a.

n=m : M                          n=nr.moli     m=masa subst.    M=masa molara

m= n . M

MNaOH=23 + 16 +1= 40-------> 40 g/moli

m= 5moli . 40g/moli=200g NaOH

b.

n= m : M

MNH3=14+3=17-------> 17g/moli

n= 255g : 17g/moli= 15 moli NH3

c.

n= 36,5g: 36,5g/moli=1molHCl

1mol HCl--------> 6,023.10²³ molecule de HCl

n=109,5g : 36,5g/moli=3moli HCl

1mol HCl---------6,023.10²³molecule

3moliHCl-------------------x

x=3 .  6,023.10²³=18,069 .10²³molecule HCl