Question

Ce cantitate de O2 se gaseste in 2 molii de apa.URGENTTTTTTTTTTTTTTTTTT!

Answer 1

Răspuns:

Explicație:

2moli H2O

mO

-se afla masa molara a apei

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

n=nr. moli  ;  m=masa subst.;  M=masa molara

n= m: M

m= n . M

m=2moli . 18g/moli=36g H2O

18g H2O-----------16g O

36gH2O--------------xgO

x=36 .16  : 18=32g O