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\(a.2NaOH+H_2SO_4\rightarrow Na_2SO_4+2H_2O\\ b.n_{NaOH}=\dfrac{20}{40}=0,5\left(mol\right)\\ n_{H_2SO_4}=\dfrac{1}{2}n_{NaOH}=0,25\left(mol\right)\\ \Rightarrow CM_{H_2SO_4}=\dfrac{0,25}{0,1}=2,5M\\ c.n_{Na_2SO_4}=\dfrac{1}{2}n_{NaOH}=0,25\left(mol\right)\\ \Rightarrow m_{Na_2SO_4}=0,25.142=35,5\left(g\right)\)
Bài 2 :
\(n_{Fe_2O_3}=\dfrac{16}{160}=0,1\left(mol\right)\)
PTHH :
\(Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2O\)
0,1 0,3 0,1 0,3
\(m_{Fe_2\left(SO_4\right)_3}=0,1.400=40\left(g\right)\)
\(b,V_{ddH_2SO_4}=\dfrac{0,3}{2}=0,15\left(l\right)\)
\(c,C_{M\left(Fe_2\left(SO_4\right)_3\right)}=\dfrac{0,1}{0,15}=\dfrac{2}{3}\left(M\right)\)
Bài 3 :
\(n_{Mg}=\dfrac{4.8}{24}=0,2\left(mol\right)\)
PTHH :
\(Mg+H_2SO_4\rightarrow MgSO_4+H_2O\)
0,2 0,2 0,2 0,2
\(m_{MgSO_4}=0,2.120=24\left(g\right)\)
\(V_{H_2}=0,2.24,79=4,958\left(l\right)\)
\(c,C_{M\left(H_2SO_4\right)}=\dfrac{0,2}{0,2}=1\left(M\right)\)
\(d,C_{M\left(MgSO_4\right)}=\dfrac{0,2}{0,2}=1\left(M\right)\)
Bài 4 :
\(n_{Al}=\dfrac{8,1}{27}=0,3\left(mol\right)\)
PTHH :
\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\uparrow\)
0,3 0,45 0,15 0,45
\(V_{H_2}=0,45.24,79=11,1555\left(l\right)\)
\(m_{H_2SO_4}=0,45.98=44,1\left(g\right)\)
\(C\%_{H_2SO_4}=\dfrac{44,1}{300}.100\%=14,7\%\)
\(m_{Al_2\left(SO_4\right)_3}=0,15.342=51,3\left(g\right)\)
\(m_{dd}=8,1+300-\left(0,45.2\right)=307,2\left(g\right)\)
\(C\%_{Al_2\left(SO_4\right)_3}=\dfrac{51,3}{307,2}.100\%\approx16,7\%\)
Bài 5 :
\(n_{H_2}=\dfrac{4,958}{24,79}=0,2\left(mol\right)\)
PTHH:
\(Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)
0,2 0,4 0,2 0,2
\(m_{Fe}=0,2.56=11,2\left(g\right)\)
\(C_{M\left(HCl\right)}=\dfrac{0,4}{0,2}=2\left(M\right)\)
\(C_{M\left(FeCl_2\right)}=\dfrac{0,2}{0,2}=1\left(M\right)\)
a, \(n_{HCl}=0,2.2=0,4\left(mol\right)\)
PTHH: HCl + KOH → KCl + H2O
Mol: 0,4 0,4 0,4
b, \(V_{ddKOH}=\dfrac{0,4}{1,5}=\dfrac{4}{15}\left(l\right)\approx0,267\left(l\right)\)
c, \(C_{M_{ddKOH}}=\dfrac{0,4}{0,2+\dfrac{4}{15}}=\dfrac{6}{7}M\approx0,857M\)
a) \(n_{HCl}=0,2.2=0,4\left(mol\right)\)
PTHH: HCl + KOH → KCl + H2O
Mol: 0,4 0,4 0,4
b) \(V_{ddKOH}=\dfrac{0,4}{1,5}=\dfrac{4}{15}\left(l\right)\approx0,267\left(l\right)\)
c) \(C_{M_{ddKCl}}=\dfrac{0,4}{0,2+\dfrac{4}{15}}=\dfrac{6}{7}M\approx0,857M\)
a) nHCl=0,2.2=0,4(mol
PTHH: HCl + KOH → KCl + H2O
Mol: 0,4 0,4 0,4
b) VddKOH=0,4\1,5=4\15(l)≈0,267(l)
c) CMddKCl=0,4\(0,2+4\15)=6\7M≈0,857M
Bài 8: Bạn bổ sung thêm đề phần này nhé.
Bài 9: Bài này giống bài 2 bên dưới nhé.
Bài 10:
\(n_{Fe\left(NO_3\right)_3}=0,3.1=0,3\left(mol\right)\)
PT: \(Fe\left(NO_3\right)_3+3NaOH\rightarrow3NaNO_3+Fe\left(OH\right)_3\)
a, \(n_{NaOH}=3n_{Fe\left(NO_3\right)_3}=0,9\left(mol\right)\Rightarrow V_{NaOH}=\dfrac{0,9}{2}=0,45\left(l\right)\)
b, \(2Fe\left(OH\right)_3\underrightarrow{t^o}Fe_2O_3+3H_2O\)
Theo PT: \(n_{Fe_2O_3}=\dfrac{1}{2}n_{Fe\left(OH\right)_2}=\dfrac{1}{2}n_{Fe\left(NO_3\right)_3}=0,15\left(mol\right)\)
\(\Rightarrow m_{Fe_2O_3}=0,15.160=24\left(g\right)\)
Bài 11:
Ta có: \(n_{NaOH}=\dfrac{200.12\%}{40}=0,6\left(mol\right)\)
PT: \(2NaOH+FeCl_2\rightarrow2NaCl+Fe\left(OH\right)_2\)
a, \(n_{FeCl_2}=n_{Fe\left(OH\right)_2}=\dfrac{1}{2}n_{NaOH}=0,3\left(mol\right)\Rightarrow C\%_{FeCl_2}=\dfrac{0,3.127}{100}.100\%=38,1\%\)
b, \(n_{NaCl}=n_{NaOH}=0,6\left(mol\right)\)
Ta có: m dd sau pư = 200 + 100 - 0,3.90 = 273 (g)
\(\Rightarrow C\%_{NaCl}=\dfrac{0,6.58,5}{273}.100\%\approx12,86\%\)
a)\(CaSO_3+2HCl\rightarrow CaCl_2+CO_2+H_2O\)
tl 1..................2............1.............1..........1(mol)
br0,125........0,25......0,125........0,125....0,125(mol)
\(m_{CaSO_3}=\dfrac{15}{120}=0,125\left(mol\right)\)
\(\Rightarrow VddHCl=\dfrac{n}{C_M}=\dfrac{0,25}{1}=0,25\left(l\right)\)
\(\Rightarrow C_{MCaCl_2}=\dfrac{0,125}{0,25}=0,5\left(M\right)\)
\(n_{CuO}=\dfrac{8}{80}=0.1\left(mol\right)\)
\(CuO+H_2SO_4\rightarrow CuSO_4+H_2O\)
\(0.1...........0.1.........0.1\)
\(n_{NaOH}=0.24\cdot0.5=0.12\left(mol\right)\)
\(2NaOH+H_2SO_4\rightarrow Na_2SO_4+H_2O\)
\(0.12..........0.06\)
\(n_{H_2SO_4}=0.1+0.06=0.16\left(mol\right)\)
\(V_{dd_{H_2SO_4}}=\dfrac{0.16}{1}=0.16\left(l\right)\)
\(C_{M_{H_2SO_4\left(dư\right)}}=\dfrac{0.06}{0.16}=0.375\left(M\right)\)
\(C_{M_{CuSO_4}}=\dfrac{0.1}{0.16}=0.625\left(M\right)\)
PT: \(H_2SO_4+2NaOH\rightarrow Na_2SO_4+2H_2O\)
Ta có: \(n_{H_2SO_4}=0,25.1=0,25\left(mol\right)\)
a, Theo PT: \(n_{NaOH}=2n_{H_2SO_4}=0,5\left(mol\right)\Rightarrow V_{NaOH}=\dfrac{0,5}{2}=0,25\left(l\right)\)
b, Theo PT: \(n_{Na_2SO_4}=n_{H_2SO_4}=0,25\left(mol\right)\)
\(\Rightarrow C_{M_{Na_2SO_4}}=\dfrac{0,25}{0,25+0,25}=0,5\left(M\right)\)