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26 tháng 4 2023

\(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\\ a,PTHH:Mg+2CH_3COOH\rightarrow\left(CH_3COO\right)_2Mg+H_2\\ n_{H_2}=n_{\left(CH_3COO\right)_2Mg}=n_{Mg}=0,2\left(mol\right);n_{CH_3COOH}=2.0,2=0,4\left(mol\right)\\ b,V_{H_2\left(đktc\right)}=0,2.22,4=4,48\left(l\right)\\ c,m_{\left(CH_3COO\right)_2Mg}=142.0,2=28,4\left(g\right)\\ d,m_{ddCH_3COOH}=\dfrac{0,4.60.100}{12}=200\left(g\right)\)

27 tháng 4 2023

\(n_{Zn}=\dfrac{19,5}{65}=0,3\left(mol\right)\\ a,PTHH:Zn+2CH_3COOH\rightarrow\left(CH_3COO\right)_2Zn+H_2\\ b,n_{H_2}=n_{\left(CH_3COO\right)_2Zn}=n_{Zn}=0,3\left(mol\right);n_{CH_3COOH}=2.0,3=0,6\left(mol\right)\\ b,V_{H_2\left(đkc\right)}=24,79.0,3=7,437\left(l\right)\\ c,m_{\left(CH_3COO\right)_2Zn}=0,3.183=54,9\left(g\right)\\ d,C_2H_5OH+CH_3COOH\rightarrow CH_3COOC_2H_5+H_2O\\ n_{Este\left(LT\right)}=n_{CH_3COOH}=0,6\left(mol\right)\\ n_{este\left(TT\right)}=80\%.0,6=0,48\left(mol\right)\\ m=m_{este\left(TT\right)}=88.0,48=42,24\left(g\right)\)

26 tháng 4 2023

\(n_{BaCO_3}=\dfrac{19,7}{197}=0,1\left(mol\right)\\ a,PTHH:BaCO_3+2CH_3COOH\rightarrow\left(CH_3COO\right)_2Ba+CO_2+H_2O\\ n_{CO_2}=n_{\left(CH_3COO\right)_2Ba}=n_{BaCO_3}=0,1\left(mol\right)\\ b,V_{CO_2\left(đktc\right)}=0,1.22,4=2,24\left(l\right)\\ c,m_{\left(CH_3COO\right)_2Ba}=255.0,1=25,5\left(g\right)\\ d,C_2H_5OH+O_2\rightarrow\left(men.giấm\right)CH_3COOH+H_2O\\ n_{CH_3COOH}=0,1.2=0,2\left(mol\right);n_{C_2H_5OH\left(LT\right)}=n_{CH_3COOH}=0,2\left(mol\right)\\ n_{C_2H_5OH\left(TT\right)}=0,2.75\%=0,15\left(mol\right)\\ m_{C_2H_5OH\left(TT\right)}=0,15.46=6,9\left(g\right)\)

26 tháng 4 2023

\(n_{CaCO_3}=\dfrac{20}{100}=0,2\left(mol\right)\\ a,PTHH:CaCO_3+2CH_3COOH\rightarrow\left(CH_3COO\right)_2Ca+CO_2+H_2O\\ b,n_{CO_2}=n_{\left(CH_3COO\right)_2Ca}=n_{CaCO_3}=0,2\left(mol\right)\\ b,V_{CO_2\left(đktc\right)}=0,2.22,4=4,48\left(l\right)\\ c,m_{\left(CH_3COO\right)_2Ca}=0,2.158=31,6\left(g\right)\\ d,C_4H_{10}+\dfrac{5}{2}O_2\rightarrow2CH_3COOH+H_2O\\ n_{C_4H_{10}\left(LT\right)}=\dfrac{0,4}{2}=0,2\left(mol\right)\\ n_{C_4H_{10}\left(TT\right)}=0,2:50\%=0,4\left(mol\right)\\ m_{C_4H_{10}\left(tt\right)}=58.0,4=23,2\left(g\right)\)

a) PTHH: \(Mg+2HCl\rightarrow MgCl_2+H_2\uparrow\)

b) Ta có: \(n_{Mg}=\dfrac{3,6}{24}=0,15\left(mol\right)=n_{MgCl_2}\)

\(\Rightarrow m_{MgCl_2}=0,15\cdot95=14,25\left(g\right)\)

c) Theo PTHH: \(\left\{{}\begin{matrix}n_{HCl\left(p.ứ\right)}=0,3\left(mol\right)\\n_{H_2}=0,15\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{HCl\left(p.ứ\right)}=0,3\cdot36,5=10,95\left(g\right)\\m_{H_2}=0,15\cdot2=0,3\left(g\right)\end{matrix}\right.\)

Mặt khác: \(m_{dd}=m_{Mg}+m_{ddHCl}-m_{H_2}=53,3\left(g\right)\)

\(\Rightarrow m_{ddHCl}=50\left(g\right)\) \(\Rightarrow C\%_{HCl\left(p.ứ\right)}=\dfrac{10,95}{50}\cdot100\%=21,9\%\)  

2 tháng 11 2021

\(Zn + H_2SO_4 \rightarrow ZnSO_4 + H_2\)

b)

\(n_{H_2}= \dfrac{2,24}{22,4}= 0,1 mol\)

\(\)Theo PTHH:

\(n_{ZnSO_4}= n_{H_2}= 0,1 mol\)

\(m_{ZnSO_4}= 0,1 . 161=16,1g\)

c)

Theo PTHH:

\(n_{H_2SO_4}= n_{H_2}= 0,1 mol\)

\(\Rightarrow m_{H_2SO_4}= 0,1 . 98= 9,8g\)

\(\Rightarrow m_{dd H_2SO_4}= \dfrac{9,8 . 100}{20}=49g\)

8 tháng 5 2021

Sửa đề : 11.2 g sắt

\(n_{Fe}=\dfrac{11.2}{56}=0.2\left(mol\right)\)

\(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)

\(0.2....0.2.................0.2\)

\(m_{FeSO_4}=0.2\cdot152=30.4\left(g\right)\)

\(C_{M_{H_2SO_4}}=\dfrac{0.2}{0.05}=4\left(M\right)\)

8 tháng 5 2021

Excellent 

23 tháng 4 2022

a) \(n_{H_2}=\dfrac{5,6}{56}=0,1\left(mol\right)\)

PTHH: Fe + H2SO4 ---> FeSO4 + H2

          0,1------------------------------->0,1

b) VH2 = 0,1.22,4 = 2,24 (l)

c) \(n_{CuO}=\dfrac{12}{80}=0,15\left(mol\right)\)

PTHH: CuO + H2 --to--> Cu + H2O

LTL: 0,15 > 0,1 => CuO dư

Theo pthh: nCu = nH2 = 0,1 (mol)

=> mCu = 0,1.64 = 6,4 (g)

7 tháng 5 2023

`a)PTHH:`

`Mg + 2HCl -> MgCl_2 + H_2 \uparrow`

`0,2`                                      `0,2`            `(mol)`

`b)n_[Mg]=[4,8]/24=0,2(mol)`

  `=>V_[H_2]=0,2.22,4=4,48(l)`

`c)`

`CuO + H_2 -> Cu + H_2 O`

`0,2`       `0,2`                                 `(mol)`

   `=>m_[CuO]=0,2.80=16(g)`

14 tháng 3 2022

nMg = 3,6 : 24 = 0,15 (mol) 
pthh : Mg + 2HCl --> MgCl2 + H2 
           0,15-----------> 0,15 --->0,15 (mol) 
mMgCl2 = 0,15 . 95 = 14,25 (mol) 
VH2 (đkc)= 0,15. 24,79 = 3,718(l) 
 

14 tháng 3 2022

\(n_{Mg}=\dfrac{3,6}{24}=0,15mol\)

\(Mg+2HCl\rightarrow MgCl_2+H_2\)

0,15      0,3         0,15       0,15

\(m_{MgCl_2}=0,15\cdot95=14,25g\)

\(V_{H_2}=0,15\cdot22,4=3,36l\)