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1) \(n_{Na_2SO_4}=0,2.1=0,2\left(mol\right)\)
PTHH: Na2SO4 + BaCl2 → 2NaCl + BaSO4 ↓
Mol: 0,2 0,2 0,2 0,2
\(m_{BaSO_4}=0,2.233=46,6\left(g\right)\)
2) \(m_{NaCl}=0,2.58,5=11,7\left(g\right)\)
3) \(C_{M_{ddBaCl_2}}=\dfrac{0,2}{0,3}=\dfrac{2}{3}\approx0,67M\)
4) Vdd sau pứ = 0,2 + 0,3 = 0,5 (l)
\(C_{M_{ddNaCl}}=\dfrac{0,2}{0,5}=0,4M\)
5) mdd sau pứ = 500.1,101 = 550,5 (g) (0,5l = 500ml)
\(C\%_{ddNaCl}=\dfrac{11,7.100\%}{550,5}=2,12534\%\)
Bài 5:
CTPT: CxHyO
\(n_{CaCO_3}=\dfrac{40}{100}=0,4\left(mol\right)\)
PTHH: 2CxHyO + \(\dfrac{4x+y-2}{2}\)O2 --to--> 2xCO2 + yH2O
\(\dfrac{0,4}{x}\)<--\(\dfrac{0,4\left(4x+y-2\right)}{4x}\)<------0,4
Ca(OH)2 + CO2 --> CaCO3 + H2O
0,4<-----0,4
=> \(M_{C_xH_yO}=\dfrac{7,4}{\dfrac{0,4}{x}}=18,5x\left(g/mol\right)\)
=> y + 16 = 6,5x (1)
Có \(n_{O_2}=\dfrac{19,2}{32}=0,6\left(mol\right)\)
=> \(\dfrac{0,4\left(4x+y-2\right)}{4x}=0,6\)
=> 0,8x = 0,4y - 0,8 (2)
(1)(2) => x = 4; y = 10
CTPT: C4H10O
Ta có: \(n_{H_2}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\)
\(a.PTHH:\)
\(Mg+2HCl--->MgCl_2+H_2\left(1\right)\)
\(CuO+2HCl--->CuCl_2+H_2O\left(2\right)\)
b. Theo PT(1): \(n_{Mg}=n_{H_2}=0,25\left(mol\right)\)
\(\Rightarrow m_{Mg}=0,25.24=6\left(g\right)\)
\(\Rightarrow m_{CuO}=24,25-6=18,25\left(g\right)\)
c. Ta có: \(n_{CuO}=\dfrac{18,25}{80}=\dfrac{73}{320}\left(mol\right)\)
\(\Rightarrow n_{hh}=\dfrac{73}{320}+0,25=0,478125\left(mol\right)\)
Theo PT(1,2): \(n_{HCl}=2.n_{hh}=2.0,478125=0,95625\left(mol\right)\)
Đổi 300ml = 0,3 lít
\(\Rightarrow C_{M_{HCl}}=\dfrac{0,95625}{0,3}=3,1875M\)
\(\%Fe_{FeCl_3}=\dfrac{56}{56+35.5\cdot3}\simeq34,46\%\)
Fe không có trong CuSO4 nha bạn
\(M_{KNO_3}=39+14+16\cdot3=101g/mol\\ M_{H_2SO_4}=1\cdot2+32+16\cdot4=98g/mol\\ M_{CuSO_4}=64+32+16\cdot4=160g/mol\\ M_{Al\left(OH\right)_3}=27+\left(1+17\right)\cdot3=78g/mol\\ M_{NaCl}=23+35,5=58,5g/mol\)
$4Na + O_2 \xrightarrow{t^o} 2Na_2O$
$Na_2O + H_2O \to 2NaOH$
$2NaOH + CO_2 \to Na_2CO_3 + H_2O$
$Na_2CO_3 + 2HCl\to 2NaCl + CO_2 + H_2O$
$CO_2 + Ca(OH)_2 \to CaCO_3 + H_2O$
$CaCO_3 + 2HCl \to CaCl_2 + CO_2 + H_2O$
4Na+O2→2Na2O
Na2O+H2O→2NaOH
NaOH+CO2→Na2CO3
Na2CO3+CaCl2−to→CaO+CO2+2NaCl
CaO+2HCl→CaCl2+H2O
\(Ba\left(NO_3\right)_2+H_2SO_4\rightarrow2HNO_3+BaSO_4\downarrow\)
\(CaCO_3+HNO_3\rightarrow Ca\left(NO_3\right)_2+CO_2\uparrow+H_2O\)
\(3AgNO_3+H_3PO_4\rightarrow AgPO_4\downarrow+HNO_3\)