a) PTHH: Ca(OH)2 + CO2 →→ CaCO3↓↓ + H2O
b) ĐLBTKL: mCa(OH)2+mCO2=mCaCO3+mH2OmCa(OH)2+mCO2=mCaCO3+mH2O
⇒⇒ mCO2=25+4,5−18,5=11(g)mCO2=25+4,5−18,5=11(g)
Câu 2:
nO2=mM=19,232=0,6(mol)nO2=mM=19,232=0,6(mol)
PTHH: 4Al+3O2to→2Al2O34Al+3O2→to2Al2O3
Theo PTHH: ⎧⎪ ⎪⎨⎪ ⎪⎩nAl=43.nO2=43.0,6=0,8(mol)nAl2O3=23.nO2=23.0,6=0,4(mol){nAl=43.nO2=43.0,6=0,8(mol)nAl2O3=23.nO2=23.0,6=0,4(mol)
⇒⇒ {mAl=n.M=0,8.27=21,6(g)mAl2O3=n.M=0,4.102=40,8(g)