\(a.C_2H_5OH+3O_2-^{t^o}\rightarrow2CO_2+3H_2O\\ n_{C_2H_5OH}=0,3\left(mol\right)\\ n_{CO_2}=2n_{C_2H_5OH}=0,6\left(mol\right)\\ \Rightarrow V_{CO_2}=0,6.22,4=13,44\left(l\right)\\ b.n_{O_2}=3n_{C_2H_5OH}=0,6\left(mol\right)\\ MàV_{O_2}=\dfrac{1}{5}V_{kk}\\ \Rightarrow V_{kk}=V_{O_2}.5=0,6.22,4.5=67,2\left(l\right)\\ c.n_{NaOH}=0,9\left(mol\right)\\ Tacó:\dfrac{n_{NaOH}}{n_{CO_2}}=\dfrac{0,9}{0,6}=1,5\\ \Rightarrow Tạora2muốiNaHCO_3vàNa_2CO_3\\ Đặt:n_{NaHCO_3}=x\left(mol\right);n_{Na_2CO_3}=y\left(mol\right)\\ \Rightarrow\left\{{}\begin{matrix}x+y=0,6\left(BTnguyento\left(C\right)\right)\\x+2y=0,9\left(BTnguyento\left(Na\right)\right)\end{matrix}\right.\\ \Rightarrow\left\{{}\begin{matrix}x=0,3\\y=0,3\end{matrix}\right.\\ \Rightarrow m_{muối}=0,3.84+0,3.106=57\left(g\right)\)

a)C2H6O+3O2to→2CO2+3H2O

0,3-------------0,9------0,6

nC2H6O=\(\dfrac{13,8}{46}\)=0,3mol

nCO2=2nC2H6O=0,6mol

⇒VCO2=0,6×22,4=13,44l

⇒Vkk=0,9×22,4×5=100,8l

a, PT: \(C_2H_4+3O_2\underrightarrow{t^o}2CO_2+2H_2O\)

Ta có: \(n_{C_2H_4}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\)

Theo PT: \(n_{O_2}=3n_{C_2H_4}=0,75\left(mol\right)\)

\(\Rightarrow V_{O_2}=0,75.2,24=16,8\left(l\right)\)

\(\Rightarrow V_{kk}=16,8.5=84\left(l\right)\)

b, Theo PT: \(n_{CO_2}=2n_{C_2H_4}=0,5\left(mol\right)\)

PT: \(CO_2+Ca\left(OH\right)_2\rightarrow CaCO_{3\downarrow}+H_2O\)

Theo PT: \(n_{Ca\left(OH\right)_2}=n_{CaCO_3}=n_{CO_2}=0,5\left(mol\right)\)

\(\Rightarrow m_{\downarrow}=m_{CaCO_3}=0,5.100=50\left(g\right)\)

\(m_{Ca\left(OH\right)_2}=0,5.74=37\left(g\right)\)

\(\Rightarrow m_{ddCa\left(OH\right)_2}=\dfrac{37.100}{2}=1850\left(g\right)\)

Bạn tham khảo nhé!

\(n_{CaCO_3}=\dfrac{7,5}{100}=0,075\left(mol\right)\)

=> n_C = 0,075 (mol)

Có \(n_{CO_2}=n_C=0,075\left(mol\right)\)

=> \(n_{H_2O}=\dfrac{4,2-0,075.44}{18}=0,05\left(mol\right)\)

=> n_H = 0,1 (mol)

\(n_{O_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)

Bảo toàn O: \(n_{O\left(A\right)}=0,075.2+0,05-0,1.2=0\left(mol\right)\)

=> A chứa C, H

m_A = m_C + m_H = 0,075.12 + 0,1.1 = 1 (g)

\(m_{tăng}=m_{H_2O}+m_{CO_2}=4,2\left(g\right)\\ n_{CaCO_3}=\dfrac{7,5}{100}=0,075\left(mol\right)\)

PTHH: Ca(OH)₂ + CO₂ ---> CaCO₃ + H₂O

                            0,075        0,075

\(\rightarrow m_{CO_2}=0,075.44=3,3\left(g\right)\\ \rightarrow m_{H_2O}=4,2-3,3=0,9\left(g\right)\\ \rightarrow n_{H_2O}=\dfrac{0,9}{18}=0,05\left(mol\right)\\ \rightarrow n_{O\left(sau.pư\right)}=0,05+0,075.2=0,1\left(mol\right)\\ n_{O\left(trong.O_2\right)}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\\ \rightarrow\left\{{}\begin{matrix}n_C=0,075\left(mol\right)\\n_H=0,05.2=0,1\left(mol\right)\\n_O=0,1-0,1=0\left(mol\right)\end{matrix}\right.\)

=> m_A = 0,075.12 + 0,1.1 + 0 = 1 (g)

Đáp án D

n_C4H10 = 0,56/22,4 = 0,025 mol

=> n_CO2 = 4.0,025 = 0,1 mol; n_H2O = 5.0,025 = 0,125 mol;

T = n_OH-/n_CO2 = 0,16/0,1 = 1,6

 => tạo ra 2 muối; n_CO3^2- = 0,06 => m_CaCO3 = 0,06.197 = 11,82 gam

A tác dụng với NaHCO₃ cho khí CO2 → A: axit CH₃COOH

BTKL: m + m_O2 = m_CO2 + m_H2O => m = 1,8

=> n_CH3COOH = 0,03

CH₃COOH + C₂H₅OH → CH₃COOC₂H₅ + H₂O

0,03                 0,02                 0,0125

=> H = 62,5%

\(n_{BaSO_3}=\dfrac{21.7}{217}=0.1\left(mol\right)\)

\(BTBa:\)

\(n_{Ba\left(HSO_3\right)_2}=0.2\cdot0.75-0.1=0.05\left(mol\right)\)

\(BTS:\)

\(n_{FeS_2}=\dfrac{0.1+0.05\cdot2}{2}=0.1\left(mol\right)\)

\(m_{FeS_2}=0.1\cdot120=12\left(g\right)\)

$n_{Ba(OH)_2} = 0,2.0,75 = 0,15(mol)$
$n_{BaSO_3} = 0,1(mol)$

TH1: $Ba(OH)_2$ dư

Ba(OH)₂ + SO₂ → BaSO₃ + H₂O

0,1..............0,1.........0,1........................(mol)

Bảo toàn nguyên tố với S : 

$n_{FeS_2} = \dfrac{1}{2}n_{SO_2} = 0,05(mol)$
$m = 0,05.120 = 6(gam)$

TH2 : Có tạo muối axit

Ba(OH)₂ + SO₂ → BaSO₃ + H₂O

0,1..............0,1.........0,1........................(mol)

Ba(OH)₂ + 2SO₂ → Ba(HSO₃)₂

0,05.............0,1........................................(mol)

$n_{SO_2} = 0,2(mol)$
$n_{FeS_2} = \dfrac{1}{2}n_{SO_2} = 0,1(mol)$
$m = 0,1.120 = 12(gam)$