Question

Calculati numarul de molecule din:
a) 3,6 kg H2O
b) 0,1 kmoli H2O​

Answer 1

Răspuns:

Explicație:

a.    3,6kg= 3600g H2O

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

n=m : M

n= 3600g : 18g/moli= 200moli H2O

1mol H2O------------6,022.10²³molecule H2 O

200moli H2O---------------------x

x= 200 . 6,022.10²³ =1204,4 .10²³molecule H2O

b.   0,1kmoli = 100moli H2O

1moli H2O-------------6,022.10²³molecule H2O

100moli ----------------y

y= 100 . 6,022.10²³ = 602,2 .10²³ molecule H2O