Question

4, 6 л паров органического вешества имеют массу 34г. при сжигании 47, 6г этого вешесива обпазуется 77г угликислого газа (н.у) и 37, 8 мл (н.у) воды. выделите молекулярную формулу органического вещества.

Answer 1

Ит?ото!пил-п?р-памперсы-псксрм

Answer 2

Molecular Formula of the Organic Substance

To determine the molecular formula of the organic substance, we can use the information provided about the mass of the substance, the products formed upon combustion, and the balanced chemical equation for the reaction.

According to the given information: - The mass of 4.6 L of the organic substance is 34 g. - Upon combustion, 47.6 g of the organic substance forms 77 g of carbon dioxide (CO2) and 37.8 mL of water (H2O) at standard conditions.

To find the molecular formula, we need to calculate the empirical formula first. The empirical formula represents the simplest whole number ratio of atoms in a compound.

Calculating the Empirical Formula

1. Calculate the number of moles of carbon dioxide (CO2) formed: - The molar mass of carbon dioxide (CO2) is 44.01 g/mol. - Therefore, the number of moles of CO2 formed is 77 g / 44.01 g/mol = 1.75 mol.

2. Calculate the number of moles of water (H2O) formed: - The molar mass of water (H2O) is 18.02 g/mol. - Therefore, the number of moles of H2O formed is 37.8 mL * (1 g/mL) / 18.02 g/mol = 2.10 mol.

3. Calculate the number of moles of carbon (C) in the organic substance: - The number of moles of carbon in CO2 is 1.75 mol * 1 mol C / 1 mol CO2 = 1.75 mol. - The number of moles of carbon in the organic substance is 1.75 mol.

4. Calculate the number of moles of hydrogen (H) in the organic substance: - The number of moles of hydrogen in H2O is 2.10 mol * 2 mol H / 1 mol H2O = 4.20 mol. - The number of moles of hydrogen in the organic substance is 4.20 mol.

5. Calculate the number of moles of oxygen (O) in the organic substance: - The number of moles of oxygen in CO2 is 1.75 mol * 2 mol O / 1 mol CO2 = 3.50 mol. - The number of moles of oxygen in the organic substance is 3.50 mol.

6. Divide the number of moles of each element by the smallest number of moles to obtain the simplest whole number ratio: - The simplest whole number ratio is C1.75H4.20O3.50.

7. Multiply the subscripts by a whole number to obtain whole number ratios: - Multiplying by 2 gives C3.50H8.40O7.00.

Therefore, the empirical formula of the organic substance is C3.50H8.40O7.00.

Determining the Molecular Formula

To determine the molecular formula, we need to know the molar mass of the empirical formula. However, without additional information about the molar mass of the organic substance, we cannot determine the molecular formula directly from the given information.

Additional information about the molar mass or the molecular weight of the organic substance is required to determine its molecular formula.

Please provide any additional information you may have, and I will be happy to assist you further.