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: \(n_{C_2H_5OH}=n_{CH_3COOH}=0,2\left(mol\right)\)

\(\Rightarrow m_{C_2H_5OH}=0,2.46=9,2\left(g\right)\)

\(\Rightarrow V_{ddC_2H_5OH}=\dfrac{9,2}{0,8}=11,5\left(ml\right)\)

Phương trình hóa học:

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

nCH3COOH = C_M.V = 0.2 x 1 = 0.2 (mol)

Theo phương trình ==> nMg = 0.1 (mol) => mMg = n.M = 0.1 x 24 = 2.4 (g)

Theo phương trình ==> nH2 = 0.1 (mol) ==> VH2 =22.4 x n = 22.4 x 0.1 = 2.24 (l)

C2H5OH + O2 => (men giấm) CH3COOH + H2O

nCH3COOH = 0.2 (mol) => nC2H5OH = 0.2 (mol)

mC2H5OH = n.M = 0.2 x 46 = 9.2 (g)

V = m/D = 9.2/8 = 1.15ml

nCH3COOH= 0.2 mol

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

Từ PTHH:

nMg= 0.1 mol

mMg=2.4g

nH2= 0.1 mol

VH2= 2.24l

C2H5OH + O2 -mg-> CH3COOH + H2O

0.2___________________0.2

mC2H5OH= 9.2g

VC2H5OH=9.2/0.8=11.5ml

V hhr= 11.5*100/8=143.75ml

Ta có: \(n_{HCl}=\dfrac{200}{1000}.2=0,4\left(mol\right)\)

\(PTHH:Mg+2HCl--->MgCl_2+H_2\uparrow\left(1\right)\)

a. Theo PT₍₁₎: \(n_{Mg}=n_{H_2}=n_{MgCl_2}=\dfrac{1}{2}.n_{HCl}=\dfrac{1}{2}.0,4=0,2\left(mol\right)\)

\(\Rightarrow\left\{{}\begin{matrix}m_{Mg}=0,2.24=4,8\left(g\right)\\V_{H_2}=0,2.22,4=4,48\left(lít\right)\end{matrix}\right.\)

b. \(PTHH:2NaOH+MgCl_2--->Mg\left(OH\right)_2\downarrow+2NaCl\left(2\right)\)

Ta có: \(n_{NaOH}=\dfrac{\dfrac{20\%.100}{100\%}}{40}=0,5\left(mol\right)\)

Ta thấy: \(\dfrac{0,5}{2}>\dfrac{0,2}{1}\)

Vậy NaOH dư.

Theo PT₍₂₎: \(n_{Mg\left(OH\right)_2}=n_{MgCl_2}=0,2\left(mol\right)\)

\(\Rightarrow m_{Mg\left(OH\right)_2}=0,2.58=11,6\left(g\right)\)

a: \(Mg+2HCl\rightarrow MgCl_2+H_2\)

200ml=0,2 lít

\(n_{HCl}=0.2\cdot22.4=4.48\left(mol\right)\)

\(\Leftrightarrow n_{H_2}=2.24\left(mol\right)\)

\(\Leftrightarrow m_{H_2}=n_{H_2}\cdot M=2.24\cdot1=2.24\left(g\right)\)

\(n_{MgCl_2}=2.24\left(mol\right)\)

\(\Leftrightarrow n_{Mg}=2.24\left(mol\right)\)

\(\Leftrightarrow m_{Mg}=2.24\cdot24=53.76\left(g\right)\)

Ta có: n_N2 = 0,22 (mol)

⇒ n_NO3^- = 10n_N2 = 2,2 (mol)

⇒ m _muối = m_X + m_NO3^- = 31 + 2,2.62 = 167,4 (g)

n_HNO3 = 12n_N2 = 2,64 (mol)

\(\Rightarrow V_{HNO_3}=\dfrac{2,64}{2}=1,32\left(l\right)=1320\left(ml\right)\)

Đáp án A

Thí nghiệm 2: 0,2 mol X + 0,6 mol KHCO₃ → 0,4 mol CO₂ + dung dịch M

Chọn đáp án B.

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

\(V_{HCl}=100ml=0,1\left(l\right)\rightarrow n_{HCl}=CM.V=1.0,1=0,1\left(mol\right)\)

\(Fe+2HCl\rightarrow FeCl_2+H_2\)

0,05    0,1         0,05    0,05

\(LTL:\dfrac{0,1}{1}>\dfrac{0,1}{2}\)

=> Fe dư , HCl đủ

\(V_{H_2}=0,05.22,4=1,12\left(l\right)\)

\(mFeCl_2=0,05.127=6,35\left(g\right)\)

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