a) \(CO_2+2NaOH\rightarrow Na_2CO_3+H_2O\)

b) \(n_{CO_2}=\dfrac{1,12}{22,4}=0,05\left(mol\right)\)

Theo PT: \(n_{NaOH}=2n_{CO_2}=0,1\left(mol\right)\)

=> \(CM_{NaOH}=\dfrac{0,1}{0,1}=1M\)

c) Sửa đề D_NaOH = 1,2g/ml

 \(m_{ddsaupu}=0,05.44+100.1,2=122,2\left(g\right)\)

\(n_{Na_2CO_3}=n_{CO_2}=0,05\left(mol\right)\)

=> \(C\%_{Na_2CO_3}=\dfrac{0,05.106}{122,2}.100=4,34\%\)

1.

a, \(n_{CO_2}=\dfrac{1,12}{22,4}=0,05\left(mol\right)\)

PTHH: CO₂ + 2NaOH → Na₂CO₃ + H₂O

Mol:     0,05       0,1

b, \(C_{M_{ddNaOH}}=\dfrac{0,1}{0,1}=1M\)

2.

a, \(m_{HCl}=200.7,3\%=14,6\left(g\right)\Rightarrow n_{HCl}=\dfrac{14,6}{36,5}=0,4\left(mol\right)\)

PTHH: CuO + 2HCl → CuCl₂ + H₂O

Mol:      0,2         0,4           0,2

b,\(m_{CuO}=0,2.80=16\left(g\right)\)

c, \(C\%_{ddCuCl_2}=\dfrac{0,2.135.100\%}{16+200}=12,5\%\)    

mHCl=200.7,3%=14,6(g)⇒nHCl=14,636,5=0,4(mol)mHCl=200.7,3%=14,6(g)⇒nHCl=14,636,5=0,4(mol)

PTHH: CuO + 2HCl → CuCl₂ + H₂O

Mol:      0,2        0,4          0,2

b,mCuO

Trả lời:

a) \(CO_2+2NaOH\Rightarrow Na_2CO_3+H_2O\)

b) \(n_{NAOH}=2n_{CO_2}=\frac{11,2\times2}{22,4}=0,10\left(mol\right)\)

Nồng độ mol của dung dịch NaOH là 1M.

a)CO2+2NaOH----->Na2CO3+H2O

b)n\(_{CO2}=\frac{1,12}{22,4}=0,05\left(mol\right)\)

Theo pthh

n\(_{NaOH}=2n_{CO2}=0,1\left(mol\right)\)

V\(_{NaOH}=\frac{0,1}{1}=0,1\left(l\right)=100ml\)

c) Theo pthh

n\(_{Na2CO3}=n_{CO2}=0,05\left(mol\right)\)

C\(_{M\left(Na2CO3\right)}=\frac{0,05}{0,1}=0,5\left(M\right)\)

Tham khảo :

a)CO2+2NaOH----->Na2CO3+H2O

b)n${}_{CO2}=\frac{1,12}{22,4}=0,05\left(mol\right)$

Theo phương trình hoá học

n${}_{NaOH}=2n_{CO2}=0,1\left(mol\right)$

V${}_{NaOH}=\frac{0,1}{1}=0,1\left(l\right)=100ml$

c) Theo phương trình hoá học

n${}_{Na2CO3}=n_{CO2}=0,05\left(mol\right)$

C${}_{M\left(Na2CO3\right)}=\frac{0,05}{0,1}=0,5\left(M\right)$

\(n_{H_2SO_4}=0,4\cdot1=0,4mol\)

\(2NaOH+H_2SO_4\rightarrow Na_2SO_4+H_2O\)

 0,8              0,4

\(V_{NaOH}=\dfrac{0,8}{0,5}=1,6l\)

\(n_{H_2SO_4}=0.4\cdot1=0.4\left(mol\right)\)

\(2NaOH+H_2SO_4\rightarrow Na_2SO_4+2H_2O\)

\(0.8.............0.4..............0.4\)

\(V_{dd_{NaOH}}=\dfrac{0.8}{0.5}=1.6\left(l\right)\)

\(V_{dd}=0.4+1.6=2\left(l\right)\)

\(C_{M_{Na_2SO_4}}=\dfrac{0.4}{2}=0.2\left(M\right)\)

\(a)Zn+2HCl\rightarrow ZnCl_2+H_2\\ b)n_{Zn}=\dfrac{13}{65}=0,2mol\\ n_{Zn}=n_{ZnCl_2}=n_{H_2}=0,2mol\\ V_{H_2}=0,2.22,4=4,48l\\ c)n_{HCl}=0,2.2=0,4mol\\ C_{M_{HCl}}=\dfrac{0,4}{0,2}=2M\\ d)m_{ZnCl_2}=0,2.136=27,2g\)

a, \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)

b, \(n_{C_2H_4}=\dfrac{8,96}{22,4}=0,4\left(mol\right)\)

Theo PT: \(n_{C_2H_4Br_2}=n_{C_2H_4}=0,4\left(mol\right)\Rightarrow m_{C_2H_4Br_2}=0,4.188=75,2\left(g\right)\)

c, \(n_{Br_2}=n_{C_2H_4}=0,4\left(mol\right)\Rightarrow C_{M_{Br_2}}=\dfrac{0,4}{0,2}=2\left(M\right)\)

a, \(n_{CO_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)

PTHH: CO₂ + 2KOH → K₂CO₃ + H₂O

Mol:      0,1        0,2           0,1

b, \(C_{M_{ddKOH}}=\dfrac{0,2}{0,1}=2M\)

c, \(m_{K_2CO_3}=0,1.138=13,8\left(g\right)\)

a, (1) 4P+5.O2->2.P2O5
(2) P2O5+4.NaOH->2.Na2HPO4+H2O
b, photpho có n=6,2:31=0,2 mol.dựa theo pt (1) thấy nP2O5=0,1mol.theo pt (2) thấy nNaOH=0,4mol vậy mNaOH=0,4.40=16 g vậy m(dd NaOH)=16:32%=50 g
c, theo pt (2) nNa2HPO4 =0,2 mol vậy mNa2HPO4=0,2.142=28,4 g
m(dd sau pư)=mP+m(dd NaOH)=6,2+50=56,2 g
=> C%(dd Na2HPO4)=28,4:56,2=50,53%