Question

Se descompun termic 500g calcar de puritate 80%. ce volum de gaz se obtine? Ce cantitate de solutie de acid sulfuric de concentratie 49% reactioneaza complet cu varul nestins rezultat din prima reactie?

Answer 1

   
         400g       y           x                                       M-masa moleculara
         CaCO3 =CaO + CO2                                MCaCO3=40+12+3.16=100
         100g       56g      44g                                MCaO=40+16=56

x=400.44:100=176 g CO2                                  MCO2=12+2.16=44

Vmolar =nr.moli  .22,4

176g CO2 le transf. in moli de CO2

176 :44=4 moli CO2

V=4 .22,4 =89,6  litri CO2




Y=400.56:100=224 gCaO

      224g    z
      CaO +H2SO4=CaSO4 +H2O             MH2SO4=2 +32 +4.16=98
     56g      98g
        
Z=224.98 :56=392 g H2SO4   (md )

c=md.100:ms

ms=md.100:c

ms=392.100:49=800 g sol . H2SO4