Question

При взаимодействии этанола массой 13,8г с оксидом меди массой 34 г получим альдегид, масса которого составила 9,24 г.рассчитайте массовую долю выхода альдегидаответ 70%

Answer 1

Дано:

m(C2H5OH) = 13.8 г
m(CuO) = 34 г
m(CH3CHO) = 9.24 г
М.в.(C2H5OH) = 46.07 г * моль(-1)
М.в.(CuO) = 79.54 г * моль(-1)
М.в.(CH3CHO) = 44.05 г * моль(-1)
Решение:
n (C2H5OH) = 13.8 / 46.07 = 0.3 моль
n (CuO) = 34 / 79.54 = 0.427 моль
n (CuO) > n (C2H5OH): этанол в недостатке
__13.8___________________x______________
H3C-CH2-OH + CuO ---> H3C-CHO + Cu + H2O
__46.07________________44.05____________
x= (44.05 * 13.8) / 46.07 = 13.195 грамм (теоретический выход)
q = (9.24 / 13.195) * 100 = 70 % (практический выход)

Ответ: 70%.

С ДНЁМ ПОБЕДЫ!!!

Answer 2

Calculation of Mass Fraction of Aldehyde

To calculate the mass fraction of the aldehyde produced in the reaction between ethanol and copper oxide, we can use the following steps:

1. Calculate the moles of ethanol and copper oxide: - The molar mass of ethanol (C2H5OH) is approximately 46.07 g/mol. - The molar mass of copper oxide (CuO) is approximately 79.55 g/mol.

Using the given masses: - Moles of ethanol = Mass of ethanol / Molar mass of ethanol - Moles of copper oxide = Mass of copper oxide / Molar mass of copper oxide

Let's calculate the moles of ethanol and copper oxide.

2. Determine the limiting reactant: - Compare the moles of ethanol and copper oxide to identify the limiting reactant.

3. Calculate the theoretical yield of the aldehyde: - Use the stoichiometry of the balanced chemical equation to determine the theoretical yield of the aldehyde.

4. Calculate the mass fraction of the aldehyde: - Mass fraction = (Actual mass of aldehyde / Theoretical mass of aldehyde) * 100%

Let's proceed with the calculations using the given information.

Calculation Steps

1. Calculate the moles of ethanol and copper oxide: - Moles of ethanol = 13.8 g / 46.07 g/mol - Moles of copper oxide = 34 g / 79.55 g/mol

The moles of ethanol and copper oxide can be calculated using the given masses and molar masses.

2. Determine the limiting reactant: - Compare the moles of ethanol and copper oxide to identify the limiting reactant.

3. Calculate the theoretical yield of the aldehyde: - Use the stoichiometry of the balanced chemical equation to determine the theoretical yield of the aldehyde.

4. Calculate the mass fraction of the aldehyde: - Mass fraction = (9.24 g / Theoretical mass of aldehyde) * 100%

Let's calculate the moles of ethanol and copper oxide first.