Question

Ajutor, am nevoie urgent pls!! (Si partial)

Answer 1

1.

H2CO3        Al2O3           HBr                P2O5          HNO3
MgO            N2O3             H3PO4          Fe2O3        CO2

2.

SiO2                             MSiO2=28+2.16=60
 cat la suta O              60gSiO2--------32 g O
                                  100 g---------------X
                                 X=100.32:60=53,3 la suta O

H3PO4                   M=3+31+4.16=98
                                 98 g H3PO4-------------64 g O
                                 100 g-------------------------y
                                 y=100.64:98=65,3 la suta O

3.

     CaCO3 +2HCl =CaCl2 +CO2 +H2O

       MgCl2 +H2SO4=MgSO4 +2HCl
    
Fe(OH)2 +2 HCl =FeCl2 +2H2O

CaO +CO2=CaCO3



4.
                                          Xg         3,12 g
gCO2                               CO2 +Ca(OH)2 =CaCO3 +H2O
12g sol.Ca(OH)2                44g   74 g
c=26
                                            
c=26                               c =md .100:ms
                                       md=c.ms:100
                                       md=26.12:100=3,12 g Ca(OH)2

                                       X=3,12.44:74=1,85 g CO2