Question

Va rog!!! Am nevoie urgent!!

Answer 1

1.

CO2+ H2O---->H2CO3

                     <-----

NH3+HCl=NH4Cl

Mg +Cl2=MgCl2

N2+O2=2NO

N2O5 + H2O=2HNO3

2SO2+O2=2SO3

4Al+3O2=2Al2O3

Al2O3

raport atomic=r.a=2Al :3O=2:3

raport de masa=r.m.=2AAl:3AO=2.27:3.16=54:48=27:24=9:8

M=54+48=102------->1mol=102g

102g Al2O3--------54g Al----------48g O

100 g-------------------x-----------------y

x=100.54:102=52,94 la suta Al

y=100.48:102=47,05 la suta O

2.

Na2O+ H2O=2NaOH react. comb.

Cu SO4+2NaOH=Cu(OH)2 +Na2SO4

2H2O2= 2H2O+ O2

H2SO4 + 2NaOH=Na2SO4 +2H2O

P2O3+3H2O=2H3PO3 r .c.

N2O5 + H2O=2HNO3 r.c.

3.

Zn +S=ZnS

Mg+ MgS

Fe+ S=FeS

2Al +3 S=Al2S3

Cu + S=Cu S

4.

S+ O2=SO2

P4+ 5O2=P4O10

N2+ O2=2NO

C+O2=CO2

2H2+ O2=2H2O