Question

При полном сгорании органического вещества, не содержащего кислород, образовалось 16,8 л (н.у.) углекислого газа, 20,25 г воды и 2,8 л (н.у.) азота. Плотность паров вещества по водороду составляет 29,5. При исследовании химических свойств этого вещества было установлено, что его водный раствор окрашивает индикатор метилоранж в жёлтый цвет и при взаимодействии паров вещества бромоводородом образуется кристаллическое вещество.

Answer 1

Analysis of the Given Information

According to the given information, when an organic substance that does not contain oxygen undergoes complete combustion, the following products are formed: - 16.8 liters (at standard temperature and pressure) of carbon dioxide (CO2) - 20.25 grams of water (H2O) - 2.8 liters (at standard temperature and pressure) of nitrogen gas (N2)

The density of the vapor of the substance, relative to hydrogen, is 29.5. Additionally, it was observed that the aqueous solution of the substance turns methyl orange indicator yellow, and when the vapor of the substance reacts with hydrogen bromide (HBr), a crystalline substance is formed.

Determining the Substance

To determine the identity of the substance, we can analyze the given information and make use of relevant chemical properties.

1. Combustion Products: The formation of carbon dioxide (CO2), water (H2O), and nitrogen gas (N2) during combustion suggests that the substance contains carbon, hydrogen, and nitrogen.

2. Density of Vapor: The density of the vapor of the substance, relative to hydrogen, is 29.5. This information can be used to calculate the molar mass of the substance.

3. Color Change with Methyl Orange: The fact that the aqueous solution of the substance turns methyl orange indicator yellow indicates that the substance is acidic in nature.

4. Formation of Crystalline Substance with HBr: The reaction between the vapor of the substance and hydrogen bromide (HBr) resulting in the formation of a crystalline substance suggests that the substance contains a functional group that can react with HBr.

Based on these observations, it is likely that the substance is an organic acid containing carbon, hydrogen, and nitrogen.

Conclusion

In conclusion, the given information suggests that the substance is an organic acid that undergoes combustion to produce carbon dioxide, water, and nitrogen gas. The substance is acidic in nature and reacts with hydrogen bromide to form a crystalline substance. However, without additional information or specific chemical tests, it is not possible to determine the exact identity of the substance.

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