Răspuns:
Explicație:
CaSO4
A.
r.a.= 1 : 1 :4
B.
r.m.=40 : 32 : 4.16
=40 : 32 : 64 se simplif. cu 8
=5 : 4 : 8
C.
M= 40+ 32+ 64= 136 -------->136g/moli
D.
136g CaSO4-------40g Ca-------32 g S ---------64 g O
100g CaSO4-----------x----------------y-----------------z
x= 100 .40 : 136= 29,41 % Ca
y=100.32 : 136=23,53 % S
z= 100. 64 : 136=47,06 % O
E.
n= m : M
m= n . M
m=4moli . 136g/moli=544 g CaSO4
F.
136g CaSO4--------64 g O
xg------------------------80gO
x= 136 .80 : 64=170 g CaSO4
n=170g : 136g/moli =1,25 moliCaSO4
g.
136gCaSO4----------64 gO
600g---------------------y
y=600 .64 : 136= 282 , 35 gO
n=282,35g : 32g/moli=8,82 moliO2
H.
n= 80g : 136g/moli=0,59 moliCaSO4
1molCaSO4---------6,023.10²³moleculeCaSO4
0,59moli-------------------------z
z= 0,59 . 6,023.10²³ molecule=
