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Câu 5 :
a)
$n_{NaOH} = 0,1.2,5 = 0,25(mol)$
$m_{NaOH} = 0,25.40 = 10(gam)$
b)
$C_{M_{CaCl_2}} = \dfrac{0,02}{0,2} = 0,1M$
c)
$C\%_{NaCl} = \dfrac{6}{6 + 144}.100\% = 4\%$
![](https://rs.olm.vn/images/avt/0.png?1311)
B1:
a) mdd = 80 + 120 = 200 (g)
C%Na2CO3 = 80/200 = 40%
b) C%K3PO4 = 63,6/200 = 31,8%
B2:
a) mBaCl2 = 15% . 200 = 30 (g)
b) mKNO3 = 12% . 250 = 30 (g)
B3:
a) mNaCl = 250 . 11,7% = 29,25 (g)
nNaCl = 29,25/58,5 = 0,5 (mol)
b) nKMnO4 = 0,25 . 4 = 1 (mol)
B4:
a) mFe(NO3)3 = 0,25 . 242 = 60,5 (g)
mdd = 189,5 + 60,5 = 250 (g)
C%Fe(NO3)3 = 60,5/250 = 24,2%
b) nK3PO4 = 42,4/212 = 0,2 (mol)
CMK3PO4 = 0,2/0,5 = 0,4M
B5:
a) nBa(OH)2 = 0,3 . 1,5 = 0,45 (mol)
mBa(OH)2 = 0,45 . 171 = 76,95 (g)
b) nNaOH = 6/40 = 0,15 (mol)
VddNaOH = 0,15/2 = 0,075 (l)
![](https://rs.olm.vn/images/avt/0.png?1311)
2.
a) 4Cr + 3O2 → 2Cr2O3 (4:3:2)
b) 2Fe + 3Br2 → 2FeBr3 (2:3:2)
c) 2KClO3 → 2KCl + 3O2 (2:2:3)
d) 2NaNO3 → 2NaNO2 + O2 (2:2:1)
e) Zn + 2HCl → ZnCl2 + H2 (1:2:1:1)
g) S + O2 → SO2 (1:1:1)
f) 4P + 5O2 → 2P2O5 (4:5:2)
i) 3Fe + 2O2 → Fe3O4 (3:2:1)
k) CH4 + 2O2 → CO2 + 2H2O (1:2:1:2)
m) 2NaOH + H2SO4 → Na2SO4 + 2H2O (2:1:1:2)
n) BaCl2 + 2AgNO3 →2AgCl + Ba(NO3)2 (1:2:2:1)
s) Fe + 2AgNO3 → Fe(NO3)2 + 2Ag(1:2:1:2)
t) 2Al(OH)3 → Al2O3 + 3H2O (2:1:3)
3. a) 2C2H2 + 5O2 → 4CO2 + 2H2O (2:5:4:2)
b) 2Al + 6HCl → 2AlCl3 + 3H2 (2:6:2:3)
![](https://rs.olm.vn/images/avt/0.png?1311)
nC = \(\dfrac{6}{12}=0,5\left(mol\right)\)
\(n_{O_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)
PTHH: C + O2 ---to---> CO2.
Ta thấy: \(\dfrac{0,5}{1}>\dfrac{0,1}{1}\)
=> Cacbon dư
Theo PT: \(n_{CO_2}=n_{O_2}=0,1\left(mol\right)\)
=> \(V_{CO_2}=0,1.22,4=2,24\left(lít\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a)Bazo: \(NaOH\) natri hidroxit
\(Fe\left(OH\right)_3\) sắt (lll) hidroxit
\(Ba\left(OH\right)_2\) bari hidroxit
Axit: \(H_2SO_4\) axit sunfuric
\(H_2S\) khí hidrosunfua
\(H_3PO_4\) axit photphoric
Muối: \(NaHCO_3\) natri hidrocacbonat
\(CaCO_3\) canxi cacbonat
\(ZnSO_4\) kẽm sunfat
\(Ca\left(HSO_4\right)_2\) canxi hidrosunfat
\(Ca\left(NO_3\right)_2\) canxi nitrat
\(Na_2S\) natri sunfide
Oxut bazo: \(CuO\) đồng (ll) oxit
\(Na_2O\) natri oxit
Oxit axit: \(P_2O_5\) điphotpho pentaoxit
\(CO_2\) cacbon đioxit
b)\(P_2O_5+3H_2O\rightarrow2H_3PO_4\)
\(CO_2+H_2O\rightarrow H_2CO_3\)
\(Na_2O+H_2O\rightarrow2NaOH\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(1A\\ 2D\\ 3B\\ 4D\\ 5A\\ 6C\\ 7A\\ 8C\\ 9B\\ 10D\\ 11B\\ 12C\\ 13C\\ 14B\\ 15C\\ 16B\\ 17D\\ 18A\\ 19C\\ 20C\\ 21A\\ 22D\\ 23B\\ 24A\\ 25A\\ B\\ 27B\\ 28C\)
\(Cl_2+Mg-^{t^o}\rightarrow MgCl_2\\ MgCl_2+2NaOH\rightarrow Mg\left(OH\right)_2+2NaCl\\ Mg\left(OH\right)_2-^{t^o}\rightarrow MgO+H_2O\\ MgO+H_2SO_4\rightarrow MgSO_4+H_2O\)