Question

determina cantitatea exprimata in grame de hidrogen si oxigen cuprinsa in 5moli de apa

Answer 1

Răspuns:

Explicație:

5 moli H2O

-se calculeaza  masa molara a apei

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

-se afla masa in g a celor 5 moli H2O

n=m : M

m= n . M

m= 5moli. 18g/moli=90g H2O

18g H2O---------2g H ---------16 g O

90g -------------------xg-------------yg

x=90 . 2 : 18 = 10g H

n=10g : 2g/moli = 5moli H2

y= 90 . 16 : 18 =80 g O

n= 80g : 32g/moli = 2,5 moliO2