Question

VA ROG ESTE URGENTTTTT​

Answer 1

Răspuns:

Explicație:

a.

5moli Ca(OH) 2

m=?

n= m : M

m= n . M

M Ca(OH)2= 40 + 2.16 + 2=74 --------> 74g/moli

m = 5moli. 74g/moli = 370 g Ca(OH)2

b.

n= m : M

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

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

c.

====>nr.molecule din 36,5g HCl

n =36,5g : 36,5 g/moli = 1mol HCl

1mol HCl-------------> 6,022 .10²³ molecule HCl

====>nr. molecule din 109,5 g HCl

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

1mol HCl--------- 6,022 .10²³  molecule HCl

3moli------------------y

y= 3 . 6,0 22 .10²³      molecule HCl    = 18,066.10²³   HCl