Ответ:

4.

Hg-2

Cr-3

Ni-3

P-5

Mn-7

N-3

C-4

Al-3

S-2

Ca-2

5.

H2O

Al2O3

CO2

Zn O

HgO

6.

CuO

CO2=12+32=44

Fe3O4=56×3+16×4=232

SiO2=28+32=60

Na2SO4=23×2+32+16+4=142

NH3=3+14=17

Mg(NO3) 2= 28+16×6+24=148

7.

NH4Cl

N-26, 2%

H-7, 5%

Cl-66, 3%

NaNO3

Na-27%

N-16, 5%

O-56, 5%

HNO3

H-1, 6%

N-22, 2%

O-76, 2%

Na2O

Na-74, 2%

O-25, 8%

H2S

H-5, 9%

S-94, 1 %

10.

2Fe+3 Cl2=2FeCl3

2N2+3H2=2NH3

WO3+3H2=W+3H2O

2Fe(OH) 3= Fe2O3+ 3H2O

Mg(OH) 2+ 2HCl= MgCl2+ 2H2O

Cr2(SO4) 3 + 3NaOH= Cr(OH)3+3 Na2SO4

2HNO3+ CuO= Cu(NO3) 2 + H2O

Fe2(SO4) 3 +2 Na3 PO4=2 FePO4+ 3Na2SO4