Question

cate grame de H2O se obtin daca se utilizeaza 12 grame H2

Answer 1

Pai avem asa :  $2H_{2} + O_{2}--> 2H _{2} O$
Masa Molara  = 2*1= 2 g/mol $(H _{2})$
Masa Molara= 2*1+16=18 g/mol $(H _{2} O)$
⇒ x= (12*18)/2 = 108 g ($H_{2}O$

Answer 2

.......................
2H2+O2=2H2O

m H2O=(12*18)/2=108