Question

In atasare sunt toate exercitiile

Answer 1

Răspuns:

1.

a)

Z=20 Ca

1s2 2s2 2p6 3s2 3p6 4s2

CaO oxidul de calciu

MCaO=40+16=56g/mol

b)

Ca + 2H2O → Ca(OH)2 + H2

Ca(OH)2 hidroxid de calciu

MCa(OH)2=40+2×16+2×1=74g/mol

c)

H2SO4 acid sulfuric

MH2SO4=2×1+32+4×16=98g/mol

d)

Fe2(SO4)3 Sulfat de fier III

MFe2(SO4)3=2×56+3×32+12×16=352g/mol

2.

raport atomic=Ca:O=1:

raport atomic= Ca:O:H=1:2:2

raport atomic=H:S:O=2:1:4

raport atomic=Fe:S:O=2:3:12

3.

NaOH

raport de masa=Na:O:H=23:16::1

FeSO4

raport de masa=Fe:S:O=56:32:64=7:4:8

Explicație: