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\(n_{Al}=\dfrac{21,6}{27}=0,8\left(mol\right)\)
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
\(n_{Fe}=\dfrac{6,5}{56}=\dfrac{13}{112}mol\)
\(m_{CH_3COOH}=\dfrac{90\cdot20\%}{100\%}=18g\Rightarrow n_{CH_3COOH}=0,3mol\)
\(Fe+2CH_3COOH\rightarrow\left(CH_3COO\right)_2Fe+H_2\uparrow\)
\(\dfrac{13}{112}\) 0,3 0 0
\(\dfrac{13}{112}\) \(\dfrac{13}{56}\) \(\dfrac{13}{112}\) \(\dfrac{13}{112}\)
0 \(\dfrac{19}{280}\) \(\dfrac{13}{112}\) \(\dfrac{13}{112}\)
a)\(m_{\left(CH_3COO\right)_2Fe}=\dfrac{13}{112}\cdot174=20,2g\)
\(m_{H_2}=\dfrac{13}{112}\cdot2=\dfrac{13}{56}g\)
\(m_{dd\left(CH_3COO\right)_2Fe}=6,5+90-\dfrac{13}{56}=96,27g\)
\(C\%=\dfrac{20,2}{96,27}\cdot100\%=20,98\%\)
\(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right);n_{H_2SO_4}=\dfrac{245.20\%}{98}=0,5\left(mol\right)\)
\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
0,2..........0,5
Lập tỉ lệ : \(\dfrac{0,2}{2}< \dfrac{0,5}{3}\)
=> H2SO4 dư
\(n_{H_2}=\dfrac{3}{2}n_{Al}=0,3\left(mol\right)\)
=> V H2 = 0,3.22,4= 6,72(l)
\(m_{ddsaupu}=5,4+245-0,3.2=249,8\left(g\right)\)
=> \(C\%_{Al_2\left(SO_4\right)_3}=\dfrac{0,1.342}{249,8}.100=13,69\%\)
a) mH2SO4=20%.245=49(g) ->nH2SO4=49/98=0,5(mol)
nAl=5,4/27=0,2(mol)
PTHH: 2Al +3 H2SO4 -> Al2(SO4)3 +3 H2
Ta có: 0,2/2 < 0,5/3
=> H2SO4 dư, Al hết, tính theo nAl
=> nH2SO4(p.ứ)=nH2=3/2. nAl=3/2. 0,2= 0,3(mol)
=> nH2SO4(dư)=0,5 - 0,3=0,2(mol)
=>mH2SO4(dư)=0,2.98=19,6(g)
b) V(H2,đktc)=0,3.22,4=6,72(l)
c) nAl2(SO4)3= 1/2. nAl=1/2. 0,2=0,1(mol)
=>mAl2(SO4)3=342.0,1=34,2(g)
mddAl2(SO4)3=mAl+ mddH2SO4-mH2=5,4+245 - 0,3.2= 249,8(g)
=>C%ddAl2(SO4)3= (34,2/249,8).100=13,691%
\(MgCO_3+2HCl\rightarrow MgCl_2+H_2O+CO_2\)
\(CO_2+Na\left(OH\right)_2\rightarrow CaCO_3+H_2O\)
b. \(n_{MgCO_3}=\dfrac{21}{84}=0,25mol\) \(\Rightarrow n_{HCl}=2.0,25=0,5mol\)
\(V_{ddHCl}=\dfrac{0,5}{2}=0,25l\)
c. \(n_{CO_2}=n_{MgCO_3}=0,25mol\)
\(n_{CaCO_3}=n_{CO_2}=0,25mol\)
\(\Rightarrow m_{CaCO_3}=0,25.100=25g\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(n_{Zn}=\dfrac{13}{65}=0,2mol\)
\(m_{HCl}=21,9g\Rightarrow n_{HCl}=\dfrac{21,9}{36,5}=0,6\)
=> HCl dư
\(\Rightarrow n_{H_2}=0,2mol\)
\(\Rightarrow V_{H_2}=0,2.22,4=4,48l\)
bổ sung ý b)
Khối lượng dung dịch sau phản ứng = mZn + mHCl - mH2 thoát ra = 13 +150 - 0,2 .2 = 162,6 gam
Dung dịch thu được sau phản ứng gồm \(\left\{{}\begin{matrix}ZnCl_2\\HCl_{dư}\end{matrix}\right.\)
nZnCl2 = nZn = 0,2 mol => mZnCl2 = 0,2 . 136 = 27,2 gam
=> C% ZnCl2 = \(\dfrac{27,2}{162,6}\).100= 16,72%
nHCl dư = 0,6 - 0,4 = 0,2 mol
mHCl dư= 0,2.36,5 = 7,3 gam
=> C% HCl dư = \(\dfrac{7,3}{162,6}\).100 = 4,5%
PTHH: \(K_2CO_3+2HCl\rightarrow2KCl+CO_2\uparrow+H_2O\)
Ta có: \(n_{HCl}=\dfrac{200\cdot7,3\%}{36,5}=0,4\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{K_2CO_3}=n_{CO_2}=0,2\left(mol\right)\\n_{KCl}=0,4\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{ddK_2CO_3}=\dfrac{0,2\cdot138}{13,8\%}=200\left(g\right)\\V_{CO_2}=0,2\cdot22,4=4,48\left(l\right)\\m_{KCl}=0,4\cdot74,5=29,8\left(g\right)\end{matrix}\right.\)
\(a) n_{CH_3COOH} = \dfrac{200.12\%}{60} = 0,4(mol)\\ 2CH_3COOH + CaCO_3 \to (CH_3COO)_2Ca + CO_2 + H_2O\\ n_{CaCO_3} = n_{CO_2} = \dfrac{1}{2}n_{CH_3COOH} = 0,2(mol)\\ \Rightarrow a = \dfrac{0,2.100}{100\%-20\%} =25(gam)\\ V_B = 0,2.22,4 = 4,48(lít)\\ b) m_{dd\ sau\ pư} = m_{CaCO_3} + m_{dd\ CH_3COOH} - m_{CO_2} = 0,2.100 + 200 - 0,2.2 = 219,6(gam)\\ C\%_{(CH_3COO)_2Ca} = \dfrac{0,2.158}{219,6}.100\% = 36\%\)