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a) PTHH: Fe2O3 + 3H2SO4 ➜ Fe2(SO4)3 + 3H2O
b) \(n_{Fe_2O_3}=\dfrac{16}{160}=0,1\left(mol\right)\)
\(m_{H_2SO_4}=500.98\%=49\left(g\right)\)
⇒ \(n_{H_2SO_4}=\dfrac{49}{98}=0,5\left(mol\right)\)
Theo PT: \(n_{Fe_2O_3}=\dfrac{1}{3}n_{H_2SO_4}\)
Theo bài: \(n_{Fe_2O_3}=\dfrac{1}{5}n_{H_2SO_4}\)
Vì \(\dfrac{1}{5}< \dfrac{1}{3}\) ⇒ Fe2O3 hết, H2SO4 dư
Theo PT: \(n_{Fe_2\left(SO_4\right)_3}=n_{Fe_2O_3}=0,1\left(mol\right)\)
⇒ \(m_{Fe_2\left(SO_4\right)_3}=0,1.400=40\left(g\right)\)
c) Dung dịch sau phản ứng gồm: H2SO4 dư và Fe2(SO4)3
\(n_{H_2SO_4}pư=3n_{Fe_2O_3}=3.0,1=0,3\left(mol\right)\)
⇒ \(n_{H_2SO_4}dư=0,5-0,3=0,2\left(mol\right)\)
⇒ \(m_{H_2SO_4}dư=0,2.98=19,6\left(g\right)\)
\(m_{dd}=16+500=516\left(g\right)\)
\(C\%_{dd_{H_2SO_4}}=\dfrac{19,6}{516}.100\%=3,8\%\)
\(C\%_{Fe_2\left(SO_4\right)_3}=\dfrac{40}{516}.100\%=7,75\%\)
\(n_{CuSO_4}=\dfrac{200.16\%}{160}=0,2\left(mol\right)\)
PTHH :
\(CuSO_4+2NaOH\rightarrow Cu\left(OH\right)_2\downarrow+Na_2SO_4\)
0,2 0,4 0,2 0,2
\(m_{NaOH}=0,4.40=16\left(g\right)\)
\(m_{ddNaOH}=\dfrac{16.100}{10}=160\left(g\right)\)
\(c,m_{Na_2SO_4}=0,2.142=28,4\left(g\right)\)
\(m_{ddNa_2SO_4}=200+160-\left(0,2.98\right)=340,4\left(g\right)\)
\(C\%_{Na_2SO_4}=\dfrac{28,4}{240,4}.100\%\approx8,34\%\)
\(d,PTHH:\)
\(Cu\left(OH\right)_2\underrightarrow{t^o}CuO+H_2O\)
0,2 0,2
\(m_{CuO}=0,2.80=16\left(g\right)\)
a, \(CuSO_4+2NaOH\rightarrow Cu\left(OH\right)_2+Na_2SO_4\)
b, \(m_{CuSO_4}=200.16\%=32\left(g\right)\Rightarrow n_{CuSO_4}=\dfrac{32}{160}=0,2\left(mol\right)\)
\(n_{NaOH}=2n_{CuSO_4}=0,4\left(mol\right)\Rightarrow m_{ddNaOH}=\dfrac{0,4.40}{10\%}=160\left(g\right)\)
c, \(n_{Cu\left(OH\right)_2}=n_{Na_2SO_4}=n_{CuSO_4}=0,2\left(mol\right)\)
\(\Rightarrow C\%_{Na_2SO_4}=\dfrac{0,2.142}{200+160-0,2.98}.100\%\approx8,34\%\)
d, \(Cu\left(OH\right)_2\underrightarrow{t^o}CuO+H_2O\)
\(n_{CuO}=n_{Cu\left(OH\right)_2}=0,2\left(mol\right)\Rightarrow m_{CuO}=0,2.80=16\left(g\right)\)
\(n_{CuO}=\dfrac{16}{80}=0,2\left(mol\right)\)
a) Pt : \(CuO+H_2SO_4\rightarrow CuSO_4+H_2O|\)
1 1 1 1
0,2 0,2 0,2
b) \(n_{H2SO4}=\dfrac{0,2.1}{1}=0,2\left(mol\right)\)
⇒ \(m_{H2SO4}=0,2.98=19,6\left(g\right)\)
\(C_{ddH2SO4}=\dfrac{19,6.100}{200}=9,8\)0/0
c) \(n_{CuSO4}=\dfrac{0,2.1}{1}=0,2\left(mol\right)\)
⇒ \(m_{CuSO4}=0,2.160=32\left(g\right)\)
\(m_{ddspu}=16+200=216\left(g\right)\)
\(C_{CuSO4}=\dfrac{32.100}{216}=14,81\)0/0
Bài 3 :
\(n_{Al}=\dfrac{2,7}{27}=0,1\left(mol\right)\)
Pt : \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2|\)
2 3 1 3
0,1 0,15 0,05 0,15
a) \(n_{H2}=\dfrac{0,1.3}{2}=0,15\left(mol\right)\)
\(m_{H2}=0,15.2=0,3\left(g\right)\)
\(V_{H2\left(dktc\right)}=0,15.22,4=3,36\left(l\right)\)
b) \(n_{H2SO4}=\dfrac{0,1.3}{2}=0,15\left(mol\right)\)
⇒ \(m=0,15.98=14,7\left(g\right)\)
\(C_{ddH2SO4}=\dfrac{14,7.100}{200}=7,35\)0/0
c) \(n_{Al2\left(SO4\right)3}=\dfrac{0,15.1}{3}=0,05\left(mol\right)\)
⇒ \(m_{Al2\left(SO4\right)3}=0,05.342=17,1\left(g\right)\)
\(m_{ddspu}=2,7+200-0,3=302,4\left(g\right)\)
\(C_{Al2\left(SO4\right)3}=\dfrac{17,1.100}{302,4}=5,65\)0/0
Chúc bạn học tốt
Mình xin lỗi bạn nhé , bạn sửa lại giúp mình :
\(m_{ddspu}=2,7+200-0,3=202,4\left(g\right)\)
\(C_{Al2\left(SO4\right)3}=\dfrac{17,1.100}{202,4}=8,45\)0/0
a) PTHH: CuO + H2SO4 → CuSO4 + H2O (1)
b) \(n_{CuO}=\dfrac{16}{80}=0,2\left(mol\right)\)
Theo PT1: \(n_{H_2SO_4}=n_{CuO}=0,2\left(mol\right)\)
\(\Rightarrow m_{H_2SO_4}=0,2\times98=19,6\left(g\right)\)
\(\Rightarrow C\%_{ddH_2SO_4}=\dfrac{19,6}{400}\times100\%=4,9\%\)
c) Theo PT1: \(n_{CuSO_4}=n_{CuO}=0,2\left(mol\right)\)
\(\Rightarrow m_{CuSO_4}=0,2\times160=32\left(g\right)\)
\(\Sigma m_{dd}=16+400=416\left(g\right)\)
\(\Rightarrow C\%_{ddCuSO_4}=\dfrac{32}{416}\times100\%=7,69\%\)
d) CuSO4 + BaCl2 → BaSO4↓ + CuCl2 (2)
Theo PT2: \(n_{BaSO_4}=n_{CuSO_4}=0,2\left(mol\right)\)
\(\Rightarrow m_{BaSO_4}=0,2\times233=46,6\left(g\right)\)
Vậy m=46,6
PTHH.Zn+ H2SO4 -> ZnSO4 + H2
Theo bài ra ta có: nZn = 13/65 = 0,2 mol
Theo pthh và bài ta có:
+) nH2SO4 = nZn = 0,2 mol
=> mH2SO4 = 0,2 . 98 = 19,6 g
=> mdd H2SO4 = (19,6 . 100%) : 20% = 98%
+)nH2 = nZn = 0,2 mol
=> VH2 = 0,2 . 22,4 = 4,48 l
Vậy...
2) PTHH: Fe2O3 + 3H2SO4 -> Fe2(SO4)3 + 3H2O
Theo bài ra ta có: nFe2O3 = 24/160 = 0,15 mol
nH2SO4 = 2,5 . 0,2 = 0,5 mol
Theo pthh ta có: nFe2O3 pt = 1 mol ; nH2SO4 pt = 3 mol
Ta có tỉ lệ:
\(\dfrac{nFe2O3\left(bđ\right)}{nFe2O3\left(pt\right)}=\dfrac{0,15}{1}=0,15\)< \(\dfrac{nH2SO4\left(bđ\right)}{nH2SO4\left(pt\right)}=\dfrac{0,5}{3}=0,16\)
=> Sau pư, Fe2O3 tg pư hết , H2SO4 còn dư
Theo pthh và bài ta có:
+nFe2(SO4)3 = nFe2O3 = 0,15 mol
=>mFe2(SO4)3 = 0,15 . 400 = 60 g
CM dd Fe2(SO4)3 = \(\dfrac{0,15}{0,2}=0,75\)(M)
+nH2SO4 tg pư = 3. nFe2O3 = 3. 0,15 = 0,45 mol
=> nH2SO4 dư = 0,5 - 0,45 = 0,05 mol
=> CM dd H2SO4 dư = \(\dfrac{0,05}{0,2}=0,25\left(M\right)\)
Vậy....
a) nFe= 16/56 =~ 0,3 mol
mH2S04 =( C% .mdd ) /100%= ( 20.100) /100 = 20g
nH2SO4 = 20/98 =~ 0,2mol
lập pthh của pu
Fe + H2SO4 ----------> FeSO4 + H2
1mol 1mol 1mol 1mol
0,3mol 0,2mol
xét tỉ lệ nFe dư sau pư vậy tính theo mol H2SO4
nFe (pư) = (0,2 .1 )/1 =0,2mol
nFe (dư) = 0,3 -0,2 =0,1mol
mFe dư = 0,1 . 56 = 5,6 g
mFeSO4 = 0,2 .152 = 30,4 g
b) mdd sau pư = mFe + m dung môi = 16 +100=116 g
c% Fe = (5,6 / 116) .100%=~ 4,83%
c% FeSO4 =(30,4/116).100%=~ 26,21%
a) đối 200ml =0,2 lít
CMFe =n/v = 0,1 / 0,2 =0,5 mol/lít
CMFeSO4 =n/v = 0,2/0,2=1 mol /lít
a,\(n_{Al}=\dfrac{2,7}{27}=0,1\left(mol\right)\)
PTHH: 2Al + 3H2SO4 → Al2(SO4)3 + 3H2
Mol: 0,1 0,15 0,05 0,15
\(m_{H_2}=0,15.2=0,3\left(g\right)\)
\(V_{H_2}=0,15.24,79=3,7185\left(l\right)\)
b, \(m_{ddH_2SO_4}=\dfrac{0,15.98.100\%}{200}=7,35\%\)
c, mdd sau pứ = 2,7 + 200 - 0,3 = 202,4 (g)
\(C\%_{ddAl_2\left(SO_4\right)_3}=\dfrac{0,05.342.100\%}{202,4}=8,45\%\)
PTHH: \(Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2O\)
Ta có: \(\left\{{}\begin{matrix}n_{Fe_2O_3}=\dfrac{16}{160}=0,1\left(mol\right)\\n_{H_2SO_4}=\dfrac{200\cdot9,8\%}{98}=0,2\left(mol\right)\end{matrix}\right.\)
Xét tỉ lệ: \(\dfrac{0,1}{1}>\dfrac{0,2}{3}\) \(\Rightarrow\) Fe2O3 còn dư, tính theo axit
\(\Rightarrow\left\{{}\begin{matrix}n_{Fe_2\left(SO_4\right)_3}=0,1\left(mol\right)\\n_{Fe_2O_3\left(dư\right)}=\dfrac{1}{30}\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{Fe_2\left(SO_4\right)_3}=0,1\cdot400=40\left(g\right)\\m_{Fe_2O_3\left(dư\right)}=\dfrac{1}{30}\cdot160\approx5,3\left(g\right)\end{matrix}\right.\)
\(\Rightarrow C\%_{Fe_2\left(SO_4\right)_3}=\dfrac{40}{16+200-5,3}\cdot100\%\approx18,98\%\)