Question

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Answer 1

Răspuns:

Explicație:

11.

a.

1mol O2 -----------2 . 6,022.10²³atomi O

3moli---------------------x

x= 3 . 2 . 6,022.10²³= 36,132 . 10²³atomi O

b.

n=m : M

n= 3,6g : 18g/moli= 0,2moli H2 O

1mol H2O ----------1 . 6,022.10²³atomi O

0,2moli --------------------x

x= 0,2 . 6,022.10²³= 12,044.10²³atomi O

c.

1mol H2SO4------------4 . 6,022.10²³atomi O

d.

         20

n= 4.10     : 6,022.10²³ =0, 004 moli O3

1mol O3---------3 . 6,022.10²³ atomi O

0.004moli ----------------x

x= 0,004 . 6,022.10²³ = 24,088 .10²³atomi O

12.

a.

m= n . M

M NaHCO3= 23 + 1 + 12 + 3.16=84--------> 84g/moli

m= 0,02moli . 84g/moli=1,68g NaHCO3

b

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

m= 0,005moli . 40g/moli= 0,2g NaOH

c.

MH2SO4= 2 + 32 + 4.16=98-----> 98g/moli

m=0,15moli . 98g/moli= 14,7 g H2SO4

d.

MCaCO3=40 + 12 + 3.16=100-----> 100g/moli

m= 0,48moli . 100g/moli= 48g CaCO3