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17 tháng 4 2022

Gọi \(\left\{{}\begin{matrix}n_{Mg}=x\\n_{Zn}=y\end{matrix}\right.\)

\(n_{H_2}=\dfrac{6,72}{22,4}=0,3mol\)

\(Mg+2CH_3COOH\rightarrow\left(CH_3COO\right)_2Mg+H_2\)

 x                2x                            x                     x    ( mol )

\(Zn+2CH_3COOH\rightarrow\left(CH_3COO\right)_2Zn+H_2\)

 y                2y                           y                      y      ( mol )

Ta có:

\(\left\{{}\begin{matrix}24x+65y=11,3\\x+y=0,3\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}x=0,2\\y=0,1\end{matrix}\right.\)

\(\rightarrow\left\{{}\begin{matrix}m_{Mg}=0,2.24=4,8g\\m_{Zn}=0,1.65=6,5g\end{matrix}\right.\)

\(\rightarrow\left\{{}\begin{matrix}\%m_{Mg}=\dfrac{4,8}{11,3}.100=42,47\%\\\%m_{Zn}=100\%-42,47\%=57,53\%\end{matrix}\right.\)

\(m_{CH_3COOH}=60.\left(0,2+0,1\right)=18g\)

\(C\%_{CH_3COOH}=\dfrac{18}{200}.100=9\%\)

\(\left\{{}\begin{matrix}m_{\left(CH_3COO\right)_2Mg}=0,2.142=28,4g\\m_{\left(CH_3COO\right)_2Zn}=0,1.183=18,3g\end{matrix}\right.\)

\(m_{ddspứ}=11,3+200-0,3.2=210,7g\)

\(\rightarrow\left\{{}\begin{matrix}C\%_{\left(CH_3COO\right)_2Mg}=\dfrac{28,4}{210,7}.100=13,47\%\\C\%_{\left(CH_3COO\right)_2Zn}=\dfrac{18,3}{210,7}.100=8,68\%\end{matrix}\right.\)

30 tháng 4 2022

Gọi \(\left\{{}\begin{matrix}n_{Mg}=a\left(mol\right)\\n_{Zn}=b\left(mol\right)\end{matrix}\right.\)

\(n_{H_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)

PTHH:

Mg + 2CH3COOH ---> (CH3COO)2Mg + H2

a---->2a-------------------->a------------------>a

Zn + 2CH3COOH ---> (CH3COO)2Zn + H2

b---->2b------------------->b------------------>b

=> \(\left\{{}\begin{matrix}24a+65b=8,9\\a+b=0,2\end{matrix}\right.\Leftrightarrow a=b=0,1\left(mol\right)\)

=> \(\left\{{}\begin{matrix}\%m_{Mg}=\dfrac{0,1.24}{8,9}.100\%=27\%\\\%m_{Zn}=100\%-27\%=73\%\end{matrix}\right.\)

=> \(C\%_{CH_3COOH}=\dfrac{\left(0,1.2+0,1.2\right).60}{200}.100\%=12\%\)

\(m_{dd}=200+8,9-0,2.2=208,5\left(g\right)\)

=> \(\left\{{}\begin{matrix}C\%_{\left(CH_3COO\right)_2Mg}=\dfrac{0,1.142}{208,5}.100\%=6,81\%\\C\%_{\left(CH_3COO\right)_2Zn}=\dfrac{0,1.183}{208,5}.100\%=8,78\%\end{matrix}\right.\)

30 tháng 4 2022

\(n_{H_2}=\dfrac{4,48}{22,4}=0,2mol\)

Gọi \(\left\{{}\begin{matrix}n_{Mg}=x\\n_{Zn}=y\end{matrix}\right.\) ( mol )

\(\rightarrow24x+65y=8,9\left(g\right)\) (1)

\(Mg+2CH_3COOH\rightarrow\left(CH_3COO\right)_2Mg+H_2\uparrow\)

 x                2x                         x                      x       ( mol )

\(Zn+2CH_3COOH\rightarrow\left(CH_3COO\right)_2Zn+H_2\uparrow\)

 y          2y                               y                      y          ( mol )

\(\rightarrow x+y=0,2\left(mol\right)\) (2)

\(\left(1\right);\left(2\right)\rightarrow\left\{{}\begin{matrix}x=0,1\\y=0,1\end{matrix}\right.\)

\(\rightarrow\left\{{}\begin{matrix}\%m_{Mg}=\dfrac{0,1.24}{8,9}.100\%=26,96\%\\\%m_{Zn}=100\%-26,96\%=73,04\%\end{matrix}\right.\)

\(m_{CH_3COOH}=\left(2.0,1+2.0,1\right).60=24g\)

\(C\%_{CH_3COOH}=\dfrac{24}{200}.100\%=12\%\)

\(\left\{{}\begin{matrix}m_{\left(CH_3COO\right)_2Mg}=0,1.142=14,2g\\m_{\left(CH_3COO\right)_2Zn}=0,1.183=18,3g\end{matrix}\right.\)

 

6 tháng 5 2019

a, nZnO= 16,2/81= 0,2(mol)

PTHH

ZnO + 2CH3COOH -> (CH3COO)2Zn + H2O

b,theo pt ta có:

n(CH3COO)2Zn=nZnO=0,2mol

-> m(CH3COO)2Zn= 0,2 . 183= 36,6(g)

c,mình chưa làm được nha :)

23 tháng 4 2022

\(nCuO=\dfrac{80}{80}=1\left(mol\right)\)

\(CuO+2CH_3COOH\rightarrow\left(CH_3COO\right)_2Cu+H_2O\)

1             2                            1                        1

\(m_{\left(muối\right)}=1.182=182\left(g\right)\)

\(mCH_3COOH=2.60=120\left(g\right)\)

sao có 100g dd axit mà tới 120g CH3COOH ta

28 tháng 4 2022

đề này bị sai những vẫn cảm ơn bạn nhiều lắm ạ.

13 tháng 6 2021

\(n_{ZnO}=\dfrac{16.2}{81}=0.2\left(mol\right)\)

\(ZnO+H_2SO_4\rightarrow ZnSO_4+H_2O\)

CM H2SO4 = 0.2/0.1 = 2 (M) 

mZnSO4 = 0.2*161 = 32.2 (g) 

5 tháng 5 2023

 \(Fe+2CH_3COOH\rightarrow\left(CH_3COO\right)_2Fe+H_2\)

\(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)

Theo PT: \(n_{\left(CH_3COO\right)_2Fe}=n_{Fe}=0,2\left(mol\right)\Rightarrow m_{\left(CH_3COO\right)_2Fe}=0,2.174=34,8\left(g\right)\)

Ta có: \(n_{H_2}=n_{Fe}=0,2\left(mol\right)\)

m dd sau pư = 11,2 + 200 - 0,2.2 = 210,8 (g)

\(\Rightarrow C\%_{\left(CH_3COO\right)_2Fe}=\dfrac{34,8}{210,8}.100\%\approx16,51\%\)

9 tháng 11 2023

\(a)Zn+2HCl\rightarrow ZnCl_2+H_2\\ b)n_{Zn}=\dfrac{13}{65}=0,2mol\\ n_{Zn}=n_{ZnCl_2}=n_{H_2}=0,2mol\\ V_{H_2}=0,2.22,4=4,48l\\ c)n_{HCl}=0,2.2=0,4mol\\ C_{M_{HCl}}=\dfrac{0,4}{0,2}=2M\\ d)m_{ZnCl_2}=0,2.136=27,2g\)

8 tháng 6 2023

\(a.Mg+2HCl->MgCl_2+H_2\\ Fe+2HCl->FeCl_2+H_2\\ b.Giả.sử:có:100g.dd.HCl\\ n_{HCl}=\dfrac{20\%.100}{36,5}=\dfrac{40}{73}mol\\ n_{Fe}=a;n_{Mg}=b\\ 2a+2b=\dfrac{40}{73}\\ BTKL:m_{ddsau}=56a+24b+100-2\left(a+b\right)=54a+22b+100\left(g\right)\\ C\%_{MgCl_2}=\dfrac{95b}{54a+22b+100}=\dfrac{11,787}{100}\\ -54a+783,97b=100\\ a=b=0,137\left(mol\right)\\ C\%FeCl_2=\dfrac{0,137\cdot127}{\dfrac{95\cdot0,137}{11,787\%}}\cdot100\%=15,757\%\)

20 tháng 4 2022

a)Mg+2CH3COOH→Mg(CH3COO)2+H2

Zn+2CH3COOH→Zn(CH3COO)2+H2

nH2=0,3mol

Gọi a và b lần lượt là số mol của Mg và Zn

\(\left\{{}\begin{matrix}24a+65b=11,3\\a+b=0,3\end{matrix}\right.\)

→a=0,2,b=0,1

→mMg=0,2×24=4,8g

→mZn=0,1×65=6,5g

b)%mMg=\(\dfrac{4,8}{11,3}\)×100%=42,48%

%mZn=\(\dfrac{6,5}{11,3}\)×100%=57,52%

c)nCH3COOH=2nMg+2nZn=0,6mol

→mCH3COOH=0,6×60=36g

→C%CH3COOH=\(\dfrac{36}{200}\)×100%=18%

→nMg(CH3COO)2=nMg=0,2mol

→nZn(CH3COO)2=nZn=0,1mol

→mMg(CH3COO)2=0,2×142=28,4g

→mZn(CH3COO)2=0,1×183=18,3g

nH2=nMg+nZn=0,3mol

→mH2=0,6g

→mddmuối=mhỗnhợp+mddCH3COOH−mH2

→mddmuối=11,3+200−0,6=210,7g

→C%Mg(CH3COO)2=\(\dfrac{28,4}{210,7}\)×100%=13,48%

→C%Zn(CH3COO)2=\(\dfrac{18,3}{210,7}\)×100%=8,69%

 

24 tháng 4 2022

\(nCuO=\dfrac{80}{80}=1\left(mol\right)\)

\(2CH_3COOH+CuO\rightarrow\left(CH_3COO\right)_2Cu+H_2O\)

     2                     1                1                        1  (mol)

\(mCH_3COOH=2.60=120\left(g\right)\)

m muối = \(m\left(CH_3COO\right)_2Cu=1.182=182\left(g\right)\)

m H2O = 1.18 = 18 (g)

mdd = mddCH3COOH + m(CH3COO)2Cu + mH2O - mCuO

        = 100   + 182 + 18 - 80 = 220 (g)

\(C\%_{ddCH_3COOH}=\dfrac{120.100}{220}=54,55\%\)

24 tháng 4 2022

a) \(n_{CuO}=\dfrac{80}{80}=1\left(mol\right)\)

PTHH: CuO + 2CH3COOH ---> (CH3COO)2Cu + H2O

              1---->2--------------------->1

=> mmuối = 1.182 = 182 (g)

b) \(C\%_{CH_3COOH}=\dfrac{60.2}{100}.100\%=120\%\) đề có sai không vậy bạn ?