Question

Свежеприготовленный Сu(OH)2 с количеством в-ва 0,45 моль взаимодействует с 12,9 г альдегида. После завершения р-ции осадок отделили, нагрели и получили 33,6 г твердого остатка. Определите формулу альдегида.

Answer 1

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Answer 2

Calculation of the Formula of the Aldehyde

To determine the formula of the aldehyde, we need to analyze the given information about the reaction and the resulting solid residue.

The reaction involves the interaction of 0.45 moles of freshly prepared Cu(OH)2 with 12.9 grams of the aldehyde. After the reaction is complete, the precipitate is separated, heated, and yields 33.6 grams of solid residue.

To find the formula of the aldehyde, we can use the concept of stoichiometry and the molar ratios between the reactants and products.

1. Calculate the molar mass of Cu(OH)2: - Copper (Cu) has a molar mass of 63.55 g/mol. - Oxygen (O) has a molar mass of 16.00 g/mol. - Hydrogen (H) has a molar mass of 1.01 g/mol. - The molar mass of Cu(OH)2 is calculated as follows: Molar mass of Cu(OH)2 = (63.55 g/mol) + 2 * (1.01 g/mol) + 2 * (16.00 g/mol) = 97.55 g/mol.

2. Determine the moles of Cu(OH)2 used in the reaction: Moles of Cu(OH)2 = 0.45 moles.

3. Use the molar ratio between Cu(OH)2 and the aldehyde to find the moles of the aldehyde: - According to the balanced chemical equation, the molar ratio between Cu(OH)2 and the aldehyde is 1:1. - Therefore, the moles of the aldehyde are also 0.45 moles.

4. Calculate the molar mass of the aldehyde: - To find the molar mass of the aldehyde, we need to know the empirical formula of the aldehyde. - Unfortunately, the empirical formula of the aldehyde is not provided in the given information or search results.

Based on the available information, we cannot determine the formula of the aldehyde without additional data. It is necessary to know the empirical formula or have more information about the composition of the aldehyde to proceed with the calculation.

Please provide more information or clarify the question if possible, and I will be happy to assist you further.