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a, Ta có: \(n_{CH_3COOH}=\dfrac{9,6}{60}=0,16\left(mol\right)\)
PT: \(Mg+2CH_3COOH\rightarrow\left(CH_3COO\right)_2Mg+H_2\)
Theo PT: \(n_{\left(CH_3COO\right)_2Mg}=\dfrac{1}{2}n_{CH_3COOH}=0,08\left(mol\right)\)
\(\Rightarrow m_{\left(CH_3COO\right)_2Mg}=0,08.142=11,36\left(g\right)\)
b, PT: \(CH_3COOH+C_2H_5OH\underrightarrow{t^o,xt}CH_3COOC_2H_5+H_2O\)
Theo PT: \(n_{CH_3COOC_2H_5\left(LT\right)}=n_{CH_3COOH}=0,16\left(mol\right)\)
\(\Rightarrow m_{CH_3COOC_2H_5\left(LT\right)}=0,16.88=14,08\left(g\right)\)
Mà: thực tế thu được 10,56 (g)
\(\Rightarrow H\%=\dfrac{10,56}{14,08}.100\%=75\%\)
Bài 1:
PTHH: \(C_2H_5OH+O_2\xrightarrow[]{mengiấm}CH_3COOH+H_2O\)
Ta có: \(n_{C_2H_5OH}=\dfrac{115\cdot0,8}{46}=2\left(mol\right)=n_{CH_3COOH\left(lýthuyết\right)}\)
\(\Rightarrow m_{CH_3COOH\left(thực\right)}=2\cdot60\cdot90\%=108\left(g\right)\)
Bài 2:
PTHH: \(C_2H_5OH+CH_3COOH\xrightarrow[H_2SO_4\left(đ\right)]{t^o}CH_3COOC_2H_5+H_2O\)
Ta có: \(\left\{{}\begin{matrix}n_{CH_3COOH}=\dfrac{60}{60}=1\left(mol\right)\\n_{C_2H_5OH}=\dfrac{92}{46}=2\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\) Rượu còn dư, Axit p/ứ hết
\(\Rightarrow n_{CH_3COOC_2H_5\left(lýthuyết\right)}=1\left(mol\right)\) \(\Rightarrow m_{CH_3COOC_2H_5\left(thực\right)}=1\cdot88\cdot80\%=70,4\left(g\right)\)
\(n_{CH_3COOC_2H_5}=\dfrac{4,4}{88}=0,05\left(mol\right)\)
PTHH: CH3COOH + C2H5OH --H2SO4(đ),to--> CH3COOC2H5 + H2O
0,05<--------------------------------------0,05
=> \(m_{CH_3COOH\left(lý.thuyết\right)}=0,05.60=3\left(g\right)\)
=> \(m_{CH_3COOH\left(tt\right)}=\dfrac{3.100}{60}=5\left(g\right)\)
CH3COOH=0,15 mol
C2H5OH=0,1 mol
C2H5OH+CH3COOH->CH3COOC2H5+H2O
0,075-------------------------------0,075
=>CH3COOH dư
n este =0,075 mol
=>H=\(\dfrac{0,075}{0,1}\)100=75%
\(n_{CH_3COOH}=\dfrac{9}{60}=0,15\left(mol\right)\\ n_{C_2H_5OH}=\dfrac{4,6}{46}=0,1\left(mol\right)\\ CH_3COOH+C_2H_5OH⇌CH_3COOC_2H_5+H_2O\\ LTL:\dfrac{0,15}{1}>\dfrac{0,1}{1}\\ \Rightarrow TínhtheosốmolC_2H_5OH\\\Rightarrow n_{CH_3COOC_2H_5\left(lt\right)}=n_{C_2H_5OH}=0,1\left(mol\right)\\ n_{CH_3COOC_2H_5\left(tt\right)}=\dfrac{6,6}{88}=0,075\left(mol\right)\\ \Rightarrow H=\dfrac{0,075}{0,1}.100=75\%\)
a.\(V_{C_2H_5OH}=\dfrac{10.8}{100}=0,8ml\)
\(m_{C_2H_5OH}=0,8.0,8=1,6g\)
\(n_{C_2H_5OH}=\dfrac{1,6}{46}=0,034mol\)
\(C_2H_5OH+O_2\rightarrow\left(men.giấm\right)CH_3COOH+H_2O\)
0,034 0,034 ( mol )
\(m_{CH_3COOH}=0,034.60.80\%=1,632g\)
b.\(m_{dd_{CH_3COOH}}=\dfrac{1,632}{5\%}=32,64g\)
ông lớp 9 à :))
chứ sao :v