Question

VA ROOOG ajutati-ma cu tema la chimie! DAU CORANA
1. Calculati numarul de moli de hidrogen care se afla in 4 moli de acid sulfuric.
2. Ce cantitate de oxigen exprimata in grame se gaseste in 2 moli de CaO.
3. Ce cantitate de oxigen exprimata in grame se gaseste in 36g apa.
4. Determinati masa de apa care cantareste 36 g oxigen.
5. Determinati masa de amoniac in care se gasesc 28 g azot.
6. Determinati nr. de moli de oxigen
Ah=1
Ao=16
An=14
AMg=2
ACa=40
As=32

Answer 1

4 moli H2S04    1 mol H2SO4--------1molH2
Xmoli H2            4moliH2SO4-------X moli H2
                          X=4 moli H2


2moli CaO         MCaO=40+16=56
X g O2                56 g CaO-------------1 mol  CaO
                          X gCaO----------------2 moli CaO
                       X=56.2=112 g CaO

                       56 g CaO---------16 gO
                     112 gCaO----------Y gO
                       Y=112.16:56=32 g O2


36gH2O            MH2O=2+16=18
Xg O2                 18g H2O---------16 gO
                            36 gH2O---------XgO
                         X=36.16:18=32 g O



36 g O2             MH2O=18
XgH2O             18 g H2O---------16 g O
                            XgH2O----------36 gO
                            X=18.36:16=40,5 g H2O


28g NH3              MNH3=14+3=17
XgN2                  17g NH3-------------14 gN2
                          28 g NH3------------X gN2
                                X=28.14:17=23,05 gN2


Punctul 6 nu este complet