1.Câte grame de clorură de bariu (BaCl2) se obtin in urma reactiei bariului cu 400g acid clorhidric?
2.Cate grame de oxigen(O2) se consuma in reactia cu 240g bariu?
3. Cati moli de oxid de sodiu se consuma in reactia cu 180g apa, pentru a obtine hidroxid de sodiu?
4.Cate grame de acid clorhidric (HCl) se consuma in reactia cu 120g magneziu? Ce volum de gaz rezulta?
5. Cate grame de magneziu se consuma in reactia cu 140g oxigen(O2)
6. Cati moli de apa se consuma in reactia cu sodiu, pentru a obtine 160g hidroxid de sodiu? Cati moli de gaz rezulta?
7. Cate grame de clorura de calciu(CaCl2) se obtin in urma reactiei a 40g calciu cu acid clorhidric?
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1. MHCl=36,5g/mol
MBaCl2=208g/mol
Ba + 2HCl -> BaCl2 + H2
2*36,5g HCl...........208g BaCl2
400g HCl.................xg
x=208*400/73=
2. MO2=32g/mol
MBa=137g/mol
Ba + 1/2O2 -> BaO
137g Ba..............0,5*32g O2
240g Ba...............xg O2
x=16*240/137=
3. MH2O=18g/mol
n=m/M=180/18=10 moli H2O
Na2O + H2O -> 2NaOH
1 mol Na2O...........1 mol H2O
x=10 moli Na2O......10 moli H2O
4. MMg=24g/mol
MHCl=36,5g/mol
Mg + 2HCl -> MgCl2 + H2
24g Mg..............2*36,5g HCl
120g Mg................xg HCl
x=120*73/24=
5. Mg + 1/2O2 => MgO
24g Mg..................0,5*32g O2
xg Mg.....................140g O2
x=140*24/16=
6. MNaOH=40g/mol
n=m/M=160/40=4 moli NaOH
2Na + 2H2O -> 2NaOH + H2
2 moli H2O............2 moli NaOH
x=4 moli H2O........4 moli NaOH
7. MCa=40g/mol
MCaCl2=111g/mol
Ca + 2HCl -> CaCl2 + H2
40g Ca..................111g CaCl2
40g Ca..................x=111g CaCl2
MBaCl2=208g/mol
Ba + 2HCl -> BaCl2 + H2
2*36,5g HCl...........208g BaCl2
400g HCl.................xg
x=208*400/73=
2. MO2=32g/mol
MBa=137g/mol
Ba + 1/2O2 -> BaO
137g Ba..............0,5*32g O2
240g Ba...............xg O2
x=16*240/137=
3. MH2O=18g/mol
n=m/M=180/18=10 moli H2O
Na2O + H2O -> 2NaOH
1 mol Na2O...........1 mol H2O
x=10 moli Na2O......10 moli H2O
4. MMg=24g/mol
MHCl=36,5g/mol
Mg + 2HCl -> MgCl2 + H2
24g Mg..............2*36,5g HCl
120g Mg................xg HCl
x=120*73/24=
5. Mg + 1/2O2 => MgO
24g Mg..................0,5*32g O2
xg Mg.....................140g O2
x=140*24/16=
6. MNaOH=40g/mol
n=m/M=160/40=4 moli NaOH
2Na + 2H2O -> 2NaOH + H2
2 moli H2O............2 moli NaOH
x=4 moli H2O........4 moli NaOH
7. MCa=40g/mol
MCaCl2=111g/mol
Ca + 2HCl -> CaCl2 + H2
40g Ca..................111g CaCl2
40g Ca..................x=111g CaCl2
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