Question

Cati atomi de hidrogen se gasesc in fiecare din cantitatile 10 g H2O ; 20 gnh3 si 10 g HCl ?

Answer 1

H2O - 2 atomi hidrogen
gnh3 - 3 atomi hidrogen
HCl - 1 atom hidrogen 
Sper ca te-am ajutat . Coroana ? :)

Answer 2

a) Masa molara H₂O=18g/mol
1mol H2O..................18g
x moli H₂O...................10g⇒ x=0.555 moli H₂O

1 mol H₂O.......................2*6.022*10²³ atomi H
0.555 moli H₂O................y⇒ y=6.691*10²³ atomi H

b) Masa molara NH₃=17 g/mol
1 mol NH₃......................17g
z moli..............................20g⇒ z=1.176 moli NH₃

1 mol NH₃...........................3*6.022*10²³ atomi H
1.176 moli NH₃...................q⇒ q=21.254*10²³ atomi H

c) Masa molara HCl=36.5 g/mol
1mol HCl.........................36.5g
w moli...............................10g⇒ w=0.273moli HCl

1mol HCl..........................6.022*10²³ atomi H
0.273 moli HCl..................t⇒ t=1.649*10²³ atomi H