Question

va rog rapid
dau coroana

Answer 1

Răspuns:

1.a. 16p+; 16n0; 16e¯

b. K: 2e¯; L:8e¯; M:6e¯

c. Grupa VIA (16)

Perioada 3

d. K: 2e¯; L:8e¯; M:6e¯ +2e¯→ K: 2e¯; L:8e¯; M:8e¯ structura gazului rar Argon

S+2e¯→S²+

2.Carbonat de sodiu

Oxid de aluminiu

Al(NO3)3

Zn(OH)2

3.10 atomi Na

5 at. S

20 at. O

total:35at.

4.r.a. : S:O=1:3

r.m. S:O=32:48|:16=2:3

MSO3=32+48=80g/mol

80 g SO3....... 32 g S......... 48g O

100 g SO3..........X.....................Y

X=32×100/80=Calculezi %S

Y=48×100/80=Calculezi %O

5.md=?

ms=200g

c=20%

md=c×ms/100=200×20/100=40g