Question

va rog ajutati-ma !​

Answer 1

Răspuns:

M,Na2SO4=(2X23gNa +32gS+4X16gNa)/mol-=142g

a. 142g sare.........64gO

    X.....................32g            x= 32x142x64g Na2SO4=.........CALCULEAZA !!!!

b.1mol atomi..........6,023X10²³tomi----> deci, 1mol atomi Na

1mol Sare........142g..............2mol atomiNa

                             x,..................1mol atomi

                         x= 71g

c.    142kg sare...........32kgS

      x..............................6,4kg S

X= 142x6,4/142 Kg=.............................calculeaza !!!!

d  142g sare..............2x23gNa

  x......................................11,5g

x= 11,5x142/46g=..........................calculeaza !!!!!

Explicație: