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Pt: \(2CH_3COOH+Zn\rightarrow\left(CH_3COO\right)_2Zn+H_2\)
\(n_{\left(CH_3COO\right)_2Zn}=\dfrac{14,2}{183}\approx0.077mol\)
Theo pt: nH2 = n(CH3COO)2Zn = 0,077mol
=> VH2 = 1,7248l
b) Theo pt: nCH3COOH = 2n(CH3COO)2Zn = 0,154 mol
=> CMCH3COOH = 0,154 : 0,25 = 0,616M
Bài 5
Fe + 2CH3COOH \(\rightarrow\) (CH3COO)2Fe + H2(1)
nCH3COOH = \(\dfrac{4,5}{60}=0,075mol\)
a) THeo pt: n(CH3COO)2Fe = \(\dfrac{1}{2}.nCH_3COOH=0,0375mol\)
=> m = 6,525g
c) Theo pt (1) nH2 = 1/2nCH3COOH = 0,0375 mol
2H2 + O2 \(\xrightarrow[]{t^o}\) 2H2O
Theo pt: nO2 = 0,5nH2 = 0,01875mol
=> VO2 = 0,42 lít
=> Vkk = 0,42.5 = 2,1 lít
a) \(n_{\left(CH_3COO\right)_2Mg}=\dfrac{7,1}{142}=0,05\left(mol\right)\)
PTHH: 2CH3COOH + Mg --> (CH3COO)2Mg + H2
0,1<----------------------0,05------->0,05
=> VH2 = 0,05.22,4 = 1,12 (l)
b) \(C_{M\left(dd.CH_3COOH\right)}=\dfrac{0,1}{0,025}=4M\)
a, \(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
PT: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
____0,1_____0,2______0,1_____0,1 (mol)
\(V_{H_2}=0,1.24,79=2,479\left(l\right)\)
\(m_{ZnCl_2}=0,1.136=13,6\left(g\right)\)
b, \(C_{M_{HCl}}=\dfrac{0,2}{0,1}=1\left(M\right)\)
c, \(n_{CuO}=\dfrac{12}{80}=0,15\left(mol\right)\)
PT: \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
Xét tỉ lệ: \(\dfrac{0,15}{1}>\dfrac{0,1}{1}\), ta được CuO dư.
Theo PT: \(n_{CuO\left(pư\right)}=n_{Cu}=n_{H_2}=0,1\left(mol\right)\Rightarrow n_{CuO\left(dư\right)}=0,05\left(mol\right)\)
⇒ m chất rắn = mCuO (dư) + mCu = 0,05.80 + 0,1.64 = 10,4 (g)
Bài 8:
nH2SO4=0,5(mool)
PTHH: 2 KOH + H2SO4 -> K2SO4 + 2 H2O
nKOH= 2.0,5=1(mol) => mKOH=1.56=56(g)
=> mddKOH= (56.100)/25=224(g)
Bài 7:
mddNaOH= 2.1000.1,15=2300(g)
=> mNaOH=2300.30%=690(g)
=>nNaOH=690/40=17,25(mol)
??? Ủa xút là NaOH mà??
Ta có: \(n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\)
PT: \(Fe+2HCl\rightarrow FeCl_2+H_2\)
____0,1______0,2_____0,1____0,1 (mol)
a, \(C_{M_{HCl}}=\dfrac{0,2}{0,15}=\dfrac{4}{3}\left(M\right)\)
\(V_{H_2}=0,1.22,4=2,24\left(l\right)\)
b, \(FeCl_2+2NaOH\rightarrow2NaCl+Fe\left(OH\right)_2\)
Theo PT: \(n_{NaOH}=2n_{FeCl_2}=0,2\left(mol\right)\)
\(\Rightarrow V_{NaOH}=\dfrac{0,2}{2}=0,1\left(l\right)\)
\(n_{CH_3COOH}=\dfrac{300\cdot5\%}{60}=0.25\left(mol\right)\)
\(2CH_3COOH+Zn\rightarrow\left(CH_3COO\right)_2Zn+H_2\)
\(0.25........................................................0.125\)
\(V_{H_2}=0.125\cdot22.4=2.8\left(l\right)\)
\(n_{C_2H_5OH}=0.1\cdot2=0.2\left(mol\right)\)
\(CH_3COOH+C_2H_5OH⇌CH_3COOC_2H_5+H_2O\left(ĐK:H_2SO_{4\left(đ\right)},t^0\right)\)
\(0.2......................0.2.....................0.2\)
\(\Rightarrow CH_3COOHdư\)
\(m_{CH_3COOC_2H_5}=0.2\cdot88=17.6\left(g\right)\)
\(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\\a, PTHH:Fe+H_2SO_4\rightarrow FeSO_4+H_2\\ b,n_{H_2}=n_{H_2SO_4}=n_{Fe}=0,2\left(mol\right)\\ V_{H_2\left(đkc\right)}=0,2.24,79=4,958\left(l\right)\\ c,C_{MddH_2SO_4}=\dfrac{0,2}{0,4}=0,5\left(M\right)\)
2CH3COOH + Zn -- > (CH3COOH)2Zn + H2
nH2 = 2,24 / 22,4 = 0,1 (mol)
=> nCH3COOH = 0,2 (mol)
mZn = 0,1. 65 = 6,5 (g)
mH2 = 0,1.2 = 0,2 (g)
mdd = 300 + 6,5 - 0,2 = 306,3 (g)
mCH3COOH = 0,2 . 60 = 12 (g)
=> C%CH3COOH = ( 12.100 ) / 306,3 = 4%
m(CH3COO)2Zn = 0,1 . 183 = 18,3 (g)
=> (18,3.100) / 306,3 = 6%