Răspuns:
Explicație:
a.
1,5055.10 la 20= 0,0015055 .10 ²³
n = 0, 0015055.10²³ : 6,023.10²³=0,0002499 moli Ca
m= n . M
m= 0,0002499 moli .40 g/moli=
b.
12,8 kg= 12800g
n= m : M
n= 12800g : 32g/moli= 400 moli S
c.
1mol Cu ------6,023.10²³atomi Cu
0,4 moli ----------x
x= 0,4 . 6,023.10²³ atomi Cu=2,4092 .10²³atomi Cu
d.
1mol Na----------- 11 . 6,023.10²³ p
0,4 moli------------------------x
x= 0,4 . 11 . 6,023.10²³ p= 26,5012.10²³ p
e.
1mol Zn-----------30 . 6,023.10²³ e
0,1 moli ---------------x
x= 0,1 . 30 . 6,023 .10²³ e =
m= n . M
m= 0,1 moli . 65 g/moli=6,5 g Zn
verifica calculele !!!!!!
