Question

Aflati nr. de moli si nr. de molecule care se gasesc in :

a) 72 grame de apa

b) 800 grame de trioxid de sulf

Answer 1

Răspuns:

Explicație:

a.

MH2O= 2 + 16= 18-------> 18g/moli

n= m : M

n= 72g : 18g/moli= 4 moli H2O

1mol H2O------------6,022.10²³molecule H2O

4 moli------------------------x

x= 4  .  6,022.10²³molecule H2O =

b.

MSO3= 32 + 3.16=80-------> 80g/moli

n= 800g : 80g/moli= 10 moli SO3

1mol SO3----------6,022.10²³molecule SO3

10moli -------------------------y

y= 10 .6,022.10²³molecule SO3 =