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a, PT: \(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)
b, Ta có: \(n_{Fe}=\dfrac{19,6}{56}=0,35\left(mol\right)\)
Theo PT: \(n_{H_2}=n_{Fe}=0,35\left(mol\right)\Rightarrow V_{H_2}=0,35.22,4=7,84\left(l\right)\)
c, \(n_{H_2SO_4}=n_{Fe}=0,35\left(mol\right)\Rightarrow C_{M_{H_2SO_4}}=\dfrac{0,35}{0,2}=1,75\left(M\right)\)
d, \(n_{FeSO_4}=n_{Fe}=0,35\left(mol\right)\Rightarrow m_{FeSO_4}=0,35.152=53,2\left(g\right)\)
e, \(C_{M_{FeSO_4}}=\dfrac{0,35}{0,2}=1,75\left(M\right)\)
d, \(n_{H_2SO_4}=0,25.1,6=0,4\left(mol\right)\)
Xét tỉ lệ: \(\dfrac{n_{Fe}}{1}< \dfrac{n_{H_2SO_4}}{1}\), ta được H2SO4 dư.
Theo PT: \(n_{H_2SO_4\left(pư\right)}=n_{Fe}=0,35\left(mol\right)\)
\(\Rightarrow n_{H_2SO_4\left(dư\right)}=0,4-0,35=0,05\left(mol\right)\)
\(\Rightarrow m_{H_2SO_4\left(dư\right)}=0,05.98=4,9\left(g\right)\)
nAl = 5.4/27 = 0.2 (mol)
2Al + 3H2SO4 => Al2(SO4)3 + 3H2
0.2____0.3_________________0.3
VH2 = 0.3*22.4 = 6.72(l)
CM H2SO4 = 0.3/0.1 = 3 M
PTHH: \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\uparrow\)
Ta có: \(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\)
\(\Rightarrow n_{H_2}=0,3mol=n_{H_2SO_4}\) \(\Rightarrow\left\{{}\begin{matrix}V_{H_2}=0,3\cdot22,4=6,72\left(l\right)\\C_{M_{H_2SO_4}}=\dfrac{0,3}{0,1}=3\left(M\right)\end{matrix}\right.\)
nK2SO3=15.8\158=0.1(mol)
K2SO3+H2SO4→K2SO4+SO2+H2O
0.1...........................0.1..........0.1
VSO2=0.1⋅22.4=2.24(l)
CMK2SO4=0.1\0.2=0.5(M)
a)\(n_{K_2O}=\dfrac{23,5}{94}=0,25mol\)
\(K_2O+H_2O\rightarrow2KOH\)
0,25 0,25 0,5
\(C_M=\dfrac{0,5}{0,5}=1M\)
b)Để trung hòa: \(n_{H^+}=n_{OH^-}=0,5\)
\(\Rightarrow n_{H_2SO_4}=\dfrac{1}{2}n_{H^+}=0,25mol\)
\(m_{H_2SO_4}=0,25\cdot98=24,5g\)
\(\Rightarrow m_{ddHCl}=\dfrac{24,5\cdot100\%}{60\%}=\dfrac{245}{6}g\)
Thể tích dung dịch:
\(V=\dfrac{m}{D}=\dfrac{\dfrac{245}{6}}{1,5}\approx27,22ml\)
\(n_{K_2O}=\dfrac{23,5}{94}=0,25\left(mol\right)\\ K_2O+H_2O\rightarrow2KOH\\ n_{KOH}=2.0,25=0,5\left(mol\right)\\ a,C_{M\text{dd}A}=C_{M\text{dd}KOH}=\dfrac{0,5}{0,5}=1\left(M\right)\\ b,2KOH+H_2SO_4\rightarrow K_2SO_4+2H_2O\\ n_{H_2SO_4}=\dfrac{0,5}{2}=0,25\left(mol\right)\\ m_{H_2SO_4}=0,25.98=24,5\left(g\right)\\ m_{\text{dd}H_2SO_4}=\dfrac{24,5.100}{60}=\dfrac{245}{6}\left(g\right)\\ V_{\text{dd}H_2SO_4}=\dfrac{\dfrac{245}{6}}{1,5}=\dfrac{245}{9}\left(ml\right)\approx27,222\left(ml\right)\)
\(n_{H2}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\)
Pt : \(Fe+H_2SO_4\rightarrow FeSO_4+H_2|\)
1 1 1 1
0,25 0,25 0,25
a) \(n_{Fe}=\dfrac{0,25.1}{1}=0,25\left(mol\right)\)
⇒ \(m_{Fe}=0,25.56=14\left(g\right)\)
b) \(n_{H2SO4}=\dfrac{0,25.1}{1}=0,25\left(mol\right)\)
200ml = 0,2l
\(C_{M_{ddH2SO4}}=\dfrac{0,25}{0,2}=1,25\left(M\right)\)
Chúc bạn học tốt
\(n_{Fe_2O_3}=0,2(mol)\\ Fe_2O_3+6HCl \to 2FeCl_3+3H_2O\\ n_{HCl}=1,2(mol)\\ V_{ddHCl}=\frac{250}{1,25}=200(ml)=0,2(l)\\ CM_{HCl}=\frac{1,2}{0,2}=6M$\)
a, PT: \(Zn+H_2SO_4\rightarrow ZnSO_4+H_2\)
Ta có: \(n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
Theo PT: \(n_{Zn}=n_{H_2SO_4}=n_{ZnCl_2}=n_{H_2}=0,15\left(mol\right)\)
b, mZn = 0,15.65 = 9,75 (g)
c, CM (H2SO4) = 0,15/0,05 = 3 M
d, mZnSO4 = 0,15.161 = 24,15 (g)
Bạn tham khảo nhé!
Đổi 500ml=0,5l
\(n_{Ca}=\dfrac{12}{40}=0,3\left(g\right)\)
\(Ca+H_2SO_4\rightarrow CaSO_4+H_2\)
1...........1.............1............1....(mol)
0,3........0,3.......0,3............0,3..(mol)
\(C_{MH_2SO_4}=\dfrac{n}{Vdd}=\dfrac{0,3}{0,5}==0,6\left(M\right)\)