Question

Buna, ma puteti ajuta?!​

Answer 1

Răspuns:

Explicație:

4.

18g H2O

g,moli O2 =?

         xg        18g

H2 + O2 = H2O

       32g      18g

x = 18 .32 : 18= 32g O2

n= m : M

n= 32g : 32g/moli=1mol O2

5.

msHCl= 300g sol.

c=15%

g,moli ZnCl2=?

-se  afla md HCl

md= c.ms :100

md=15 .300:100=45g HCl

45g                  xg

2HCl + Zn= ZnCl2 + H2

2.36,5g         136g

x= 45 . 136 : 73=83,83 g ZnCl2

n= 83,83g : 136g/moli=0,61 moli ZnCl2

M ZnCl2= 65 + 2.35,5=136----->136g/moli