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a) PTHH: \(Mg+2CH_3COOH\rightarrow\left(CH_3COO\right)_2Mg+H_2\uparrow\)
Ta có: \(n_{CH_3COOH}=0,2\cdot1=0,2\left(mol\right)\)
\(\Rightarrow n_{Mg}=n_{H_2}=0,1\left(mol\right)\) \(\Rightarrow\left\{{}\begin{matrix}m_{Mg}=0,1\cdot24=2,4\left(g\right)\\V_{H_2}=0,1\cdot22,4=2,24\left(l\right)\end{matrix}\right.\)
b) PTHH: \(C_2H_5OH+O_2\xrightarrow[]{men}CH_3COOH+H_2O\)
Theo PTHH: \(n_{C_2H_5OH}=n_{CH_3COOH}=0,2\left(mol\right)\)
\(\Rightarrow m_{ddC_2H_5OH}=\dfrac{0,2\cdot46}{8\%}=115\left(g\right)\) \(\Rightarrow V_{C_2H_5OH}=\dfrac{115}{0,8}=143,75\left(ml\right)\)
a, \(n_{CH_3COOH}=0,2.1=0,2\left(mol\right)\)
PT: \(Mg+2CH_3COOH\rightarrow\left(CH_3COO\right)_2Mg+H_2\)
Theo PT: \(n_{Mg}=n_{H_2}=\dfrac{1}{2}n_{CH_3COOH}=0,1\left(mol\right)\)
\(\Rightarrow m=m_{Mg}=0,1.24=2,4\left(g\right)\)
\(V=V_{H_2}=0,1.22,4=2,24\left(l\right)\)
b, \(C_2H_5OH+O_2\underrightarrow{^{mengiam}}CH_3COOH+H_2O\)
Theo PT: \(n_{C_2H_5OH}=n_{CH_3COOH}=0,2\left(mol\right)\)
\(\Rightarrow m_{C_2H_5OH}=0,2.46=9,2\left(g\right)\)
\(\Rightarrow V_{ddC_2H_5OH}=\dfrac{9,2}{0,8}=11,5\left(ml\right)\)
a)
$CuO + H_2SO_4 \to CuSO_4 + H_2O$
$n_{H_2SO_4} = n_{CuO} = \dfrac{1,6}{80} = 0,02(mol)$
$C\%_{H_2SO_4} = \dfrac{0,02.98}{100}.100\% = 1,96\%$
b)
$2NaOH + H_2SO_4 \to Na_2SO_4 + 2H_2O$
$n_{NaOH} = 2n_{H_2SO_4} = 0,04(mol)$
$m_{NaOH} = 0,04.40 = 1,6(gam)$
c)
$Cu + 2H_2SO_4 \to CuSO_4 + SO_2 + 2H_2O$
Cu dư nên $n_{SO_2} = \dfrac{1}{2}n_{H_2SO_4} = 0,05(mol)$
$V_{SO_2} = 0,05.22,4 = 1,12(lít)$
a. CH3COOH + NaOH------> CH3COONa + H2O
Ta có :
n NaOH = 30.20%/100%=6g
=> n NaOH =6/40=0,15 mol
Theo PTHH : n CH3COOH= n NaOH=0,15 mol
=> C M CH3COOH =0,15/0,5=0,3M (500ml=0,5l)
b. 2CH3COOH + Na2CO3 ----------> CH3COONa + H2O + CO2
n Na2CO3 =0,5.0,2=0,1 mol
Ta có : n CH3COOH/2=0,15mol > n Na2CO3 =0,1mol
=> n CH3COOH dư, n Na2CO3 hết
Theo PTHH : n CO2 = n Na2CO3 = 0,1 mol
=> V CO2 ( ở đktc ) = 0,1.22,4=2,24l
a, nNaOH = 0,2.1 = 0,2 (mol)
PTHH: CH3COOH + NaOH ---> CH3COONa + H2O
0,2<---------0,2
=> \(\left\{{}\begin{matrix}m_{CH_3COOH}=0,2.60=12\left(g\right)\\m_{C_2H_5OH}=25,8-12=13,8\left(g\right)\end{matrix}\right.\)
=> \(\left\{{}\begin{matrix}\%m_{CH_3COOH}=\dfrac{12}{25,8}.100\%=46,5\%\\\%m_{C_2H_5OH}=100\%-46,5\%=53,5\%\end{matrix}\right.\)
b, \(\left\{{}\begin{matrix}n_{CH_3COOH}=\dfrac{6,45}{25,8}.0,2=0,05\left(mol\right)\\n_{C_2H_5OH}=\dfrac{6,45-0,05.60}{46}=0,075\left(mol\right)\end{matrix}\right.\)
PTHH: \(CH_3COOH+C_2H_5OH\xrightarrow[t^o]{H_2SO_{4\left(đ\right)}}CH_3COOC_2H_5+H_2O\)
LTL: 0,05 < 0,075 => Rượu dư
=> \(n_{CH_3COOC_2H_5\left(LT\right)}=n_{CH_3COOH}=0,05\left(mol\right)\\ \)
=> \(m_{CH_3COOC_2H_5\left(TT\right)}=0,05.88.80\%=3,52\left(g\right)\)
a.\(n_{NaOH}=0,2.1=0,2mol\)
\(CH_3COOH+NaOH\rightarrow CH_3COONa+H_2O\)
0,2 0,2 ( mol )
\(\rightarrow\left\{{}\begin{matrix}\%m_{CH_3COOH}=\dfrac{0,2.60}{25,8}=46,51\%\\\%m_{C_2H_5OH}=100\%-46,51\%=53,49\%\end{matrix}\right.\)
b.Bạn check lại đề giúp mình:((
\(D=0,8g\)/cm3
Trong 200ml rượu etylic \(11,5^o\) có:
\(V_{C_2H_5OH}=V_{dd}\cdot\dfrac{11,5}{100}=200\cdot\dfrac{11,5}{100}=23ml\)
\(\Rightarrow m_{C_2H_5OH}=D\cdot V=23\cdot0,8=18,4g\)
\(C_2H_5OH+O_2\rightarrow CH_3COOH+H_2O\)
46 60 (gam)
18,4 m (gam)
\(\Rightarrow m=24g\)
\(m_{ddCH_3COOH}=\dfrac{24}{15\%}\cdot100\%=160g\)