Question

[Yến Nguyễn]

giúp mình vs

Answer 1

[๖ۣۜDũ๖ۣۜN๖ۣۜG]

a)
P1: \(n_{CO_2}=\dfrac{0,48}{24}=0,02\left(mol\right)\)

PTHH: 2CH₃COOH + K₂CO₃ --> 2CH₃COOK + CO₂ + H₂O

                  0,04<------0,02<----------------------0,02

=> \(m_{K_2CO_3}=0,02.138=2,76\left(g\right)\)

=> \(m=\dfrac{2,76.100}{6,9}=40\left(g\right)\)

m_CH3COOH = 0,04.60 = 2,4 (g)

\(\%m_{CH_3COOH}=\dfrac{2,4}{3,78}.100\%=63,492\%\)

\(\%m_{C_2H_5OH}=\dfrac{3,78-2,4}{3,78}.100\%=36,508\%\)

\(n_{C_2H_5OH}=\dfrac{3,78-2,4}{46}=0,03\left(mol\right)\)

=> \(n_{CH_3COOH}:n_{C_2H_5OH}=0,04:0,03=4:3\)

b)

P2: Gọi \(\left\{{}\begin{matrix}n_{CH_3COOH}=4a\left(mol\right)\\n_{C_2H_5OH}=3a\left(mol\right)\end{matrix}\right.\)

PTHH: CH₃COOH + C₂H₅OH --t^o,H⁺--> CH₃COOC₂H₅ + H₂O

Xét tỉ lệ: \(\dfrac{4a}{1}>\dfrac{3a}{1}\) => Hiệu suất tính theo C₂H₅OH

\(n_{C_2H_5OH\left(pư\right)}=\dfrac{3a.75}{100}=2,25a\left(mol\right)\)

PTHH: CH₃COOH + C₂H₅OH --t^o,H⁺--> CH₃COOC₂H₅ + H₂O

                                    2,25a-------------->2,25a

=> 2,25a = \(\dfrac{7,92}{88}=0,09\)

=> a = 0,04 (mol)

=> P2 \(\left\{{}\begin{matrix}n_{CH_3COOH}=0,16\left(mol\right)\\n_{C_2H_5OH}=0,12\left(mol\right)\end{matrix}\right.\)

X chứa \(\left\{{}\begin{matrix}CH_3COOH:0,2\left(mol\right)\\C_2H_5OH:0,15\left(mol\right)\end{matrix}\right.\)

=> a = 0,2.60 + 0,15.46 = 18,9 (g)