cho 150g dd H2SO4 9,8% tác dụng vừa đủ với dd N2CO3 10,6% tính khối lượng NA2CO3 đã dùng và tình nồng đọ phần trăm của dd muối thu đc sao Phản ứng
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\(n_{H_2SO_4}=\dfrac{150.9,8\%}{98}=0,15\left(mol\right)\\ H_2SO_4+Na_2CO_3\rightarrow Na_2SO_4+H_2O+CO_2\\ n_{Na_2CO_3}=n_{H_2SO_4}=0,15\left(mol\right)\\ \Rightarrow m_{ddNa_2CO_3}=\dfrac{0,15.106}{10,6\%}=150\left(g\right)\\ n_{CO_2}=n_{H_2SO_4}=0,15\left(mol\right)\\ m_{ddsaupu}=150+150-0,15.44=293,4\left(g\right)\\ n_{Na_2SO_4}=n_{H_2SO_4}=0,15\left(mol\right)\\ C\%_{Na_2SO_4}=\dfrac{0,15.142}{293,4}.100=7,26\%\)
chị ơi cho em hỏi tại sao lại 150* 9,8% lại chia cho 98 ạ
\(m_{H_2SO_4}=150.9,8\%=14,7\left(g\right)\\ n_{H_2SO_4}=\dfrac{14,7}{98}=0,3\left(mol\right)\\ PTHH:H_2SO_4+Na_2CO_3\rightarrow Na_2SO_4+CO_2\uparrow+H_2O\\ Mol:0,3\rightarrow0,3\rightarrow0,3\rightarrow0,3\)
\(m_{Na_2CO_3}=0,3.106=31,8\left(g\right)\\ m_{ddNa_2CO_3}=\dfrac{31,8}{10,6\%}=300\left(g\right)\\ m_{Na_2SO_4}=0,3.142=42,6\left(g\right)\\ m_{CO_2}=0,3.44=13,2\left(g\right)\\ m_{dd}=150+300-13,2=436,8\left(g\right)\\ C\%_{Na_2SO_4}=\dfrac{42,6}{436,8}=9,75\%\)
mH2SO4 =mdd H2SO4.C% : 100% = 400.9,8% :100% = 39,2 (g)
=> nH2SO4 = mH2SO4 : MH2SO4 = 39,2: 98 = 0,4 (mol)
PTHH: H2SO4 + Na2CO3 ---> Na2SO4 + CO2 + H2O
0,4 ---->0,4 -----------> 0,4 -------> 0,4 (mol)
a) Theo PTHH: nNa2CO3 = nH2SO4 = 0,4 (mol)
=> mNa2CO3 = nNa2CO3. MNa2CO3 = 0,4.106 = 42,4 (g)
=> mdd Na2CO3 = mNa2CO3. 100% : C% = 42,4.100% : 10% = 424 (g)
b) Theo PTHH: nCO2 = nH2SO4 = 0,4 (mol)
=> VCO2(đktc) = 0,4.22,4 = 8,96 (lít)
c) Theo PTHH: nNa2SO4 = nH2SO4 = 0,4 (mol)
=> mNa2SO4 = nNa2SO4. MNa2SO4 = 0,4.142 = 56,8 (g)
mdd A = mdd H2SO4 + mdd Na2CO3 = 400 + 424 = 824 (g)
dd A chứa Na2SO4
=> C% Na2SO4 = (mNa2SO4 : mddA).100% = (56,8 : 824).100% = 6,89%
\(m_{CH_3COOH}=150.12\%=18g\)
\(n_{CH_3COOH}=\dfrac{18}{60}=0,3mol\)
\(2CH_3COOH+Na_2CO_3\rightarrow2CH_3COONa+CO_2+H_2O\)
0,3 0,15 0,3 0,15 ( mol )
\(m_{ddNa_2CO_3}=\left(0,15.106\right):10,6\%=150g\)
\(V_{CO_2}=0,15.22,4=3,36l\)
\(m_{CH_3COONa}=0,3.82=24,6g\)
\(m_{ddspứ}=150+150-0,15.44=293,4g\)
\(C\%_{CH_3COONa}=\dfrac{24,6}{293,4}.100=8,28\%\)
PTHH: \(Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2O\)
Ta có: \(n_{Fe_2O_3}=\dfrac{4,8}{160}=0,03\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{H_2SO_4}=0,09\left(mol\right)\\n_{Fe_2\left(SO_4\right)_3}=0,03\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{ddH_2SO_4}=\dfrac{0,09\cdot98}{9,8\%}=90\left(g\right)\\m_{Fe_2\left(SO_4\right)_3}=0,03\cdot400=12\left(g\right)\end{matrix}\right.\)
\(a.Na_2CO_3+2HCl\rightarrow2NaCl+CO_2+H_2O\\ n_{NaCl}=n_{HCl}=2.n_{CO_2}=2.\dfrac{448:1000}{22,4}=0,04\left(mol\right)\\ C_{MddHCl}=\dfrac{0,04}{0,02}=2\left(M\right)\\ b.m_{NaCl}=58,5.0,04=2,34\left(g\right)\\ c.m_{Na_2CO_3}=106.0,02=2,12\left(g\right)\\ \%m_{Na_2CO_3}=\dfrac{2,12}{5}.100=42,4\%\\ \%m_{NaCl}=100\%-42,4\%=57,6\%\)
Bài 16 :
\(n_{CO2}=\dfrac{0,448}{22,4}=0,02\left(mol\right)\)
Pt : \(Na_2CO_3+2HCl\rightarrow2NaCl+CO_2+H_2O|\)
1 2 2 1 1
0,02 0,04 0,04 0,02
a) \(n_{HCl}=\dfrac{0,02.2}{1}=0,04\left(mol\right)\)
20ml = 0,02l
\(C_{M_{HCl}}=\dfrac{0,04}{0,02}=2\left(M\right)\)
b) \(n_{NaCl}=\dfrac{0,02.2}{1}=0,04\left(mol\right)\)
⇒ \(m_{NaCl}=0,04.58,5=2,34\left(g\right)\)
c) \(n_{Na2CO3}=\dfrac{0,04.1}{2}=0,02\left(mol\right)\)
⇒ \(m_{Na2CO3}=0,02.106=2,12\left(g\right)\)
\(m_{NaCl}=5-2,12=2,88\left(g\right)\)
0/0Na2CO3 = \(\dfrac{2,12.100}{5}=42,4\)0/0
0/0NaCl = \(\dfrac{2,88.100}{5}=57,6\)0/0
Chúc bạn học tốt
\(n_{Al}=\dfrac{21,6}{27}=0,8\left(mol\right)\)
Pt : \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2O|\)
2 3 1 3
0,8 1,2 0,4 1,2
a) \(n_{H2}=\dfrac{0,8.3}{2}=1,2\left(mol\right)\)
\(V_{H2\left(dktc\right)}=1,2.22,4=26,88\left(l\right)\)
b) \(n_{H2SO4}=\dfrac{0,8.3}{2}=1,2\left(mol\right)\)
⇒ \(m_{H2SO4}=1,2.98=117,6\left(g\right)\)
\(m_{ddH2SO4}=\dfrac{117,6.100}{29,4}=400\left(g\right)\)
c) \(n_{Al2\left(SO4\right)3}=\dfrac{1,2.1}{3}=0,4\left(mol\right)\)
⇒ \(m_{Al2\left(SO4\right)3}=0,4.342=136,8\left(g\right)\)
\(m_{ddspu}=21,6+400-\left(1,2.2\right)=419,2\left(g\right)\)
\(C_{Al2\left(SO4\right)3}=\dfrac{136,8.100}{419,2}=32,63\)0/0
Chúc bạn học tốt
\(n_{CuO}=\dfrac{1.6}{80}=0.02\left(mol\right)\)
\(CuO+H_2SO_4\rightarrow CuSO_4+H_2O\)
\(0.02.......0.02.................0.02\)
\(m_{H_2SO_4}=0.02\cdot98=1.96\left(g\right)\)
\(m_{dd_{H_2SO_4}}=\dfrac{1.96}{20\%}=9.8\left(g\right)\)
\(m_{\text{dung dịch sau phản ứng }}=1.6+9.8=11.4\left(g\right)\)
\(C\%_{CuSO_4}=\dfrac{0.02\cdot160}{11.4}=28.07\%\)
mH2SO4 =mdd H2SO4.C% : 100% = 400.9,8% :100% = 39,2 (g)
=> nH2SO4 = mH2SO4 : MH2SO4 = 39,2: 98 = 0,4 (mol)
PTHH: H2SO4 + Na2CO3 ---> Na2SO4 + CO2 + H2O
0,4 ---->0,4 -----------> 0,4 -------> 0,4 (mol)
a) Theo PTHH: nNa2CO3 = nH2SO4 = 0,4 (mol)
=> mNa2CO3 = nNa2CO3. MNa2CO3 = 0,4.106 = 42,4 (g)
=> mdd Na2CO3 = mNa2CO3. 100% : C% = 42,4.100% : 10% = 424 (g)
b) Theo PTHH: nCO2 = nH2SO4 = 0,4 (mol)
=> VCO2(đktc) = 0,4.22,4 = 8,96 (lít)
c) Theo PTHH: nNa2SO4 = nH2SO4 = 0,4 (mol)
=> mNa2SO4 = nNa2SO4. MNa2SO4 = 0,4.142 = 56,8 (g)
mdd A = mdd H2SO4 + mdd Na2CO3 = 400 + 424 = 824 (g)
dd A chứa Na2SO4
=> C% Na2SO4 = (mNa2SO4 : mddA).100% = (56,8 : 824).100% = 6,89%
mơn bạn