A) 9.8g of an alcohol A completely reacts with an excess of sodium , and a gas is released. When the reaction ceases the volume of the gas is 1.6L measured at a temperature of 22ºc and under a pressure of 1 bar.
a- What gas is released in this reaction, how can it be identified?
b- Write the equation of thr reaction of alcohol with sodium .
c- Find the molecular formula of A.
B) The dehydration of alcohol A upon heating and in the presence of sulfuric acid produces only two compounds B and C. Only the molecule of C contains an oxygen atom. The relative density of B with respect to air equals 1.93.
a- Determine the molecular formulas of the compounds B and C.
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A)
a) To identify the gas released in the reaction, we need to analyze the reaction equation. When an alcohol reacts with excess sodium, the gas released is hydrogen (H₂). This can be confirmed by the balanced equation of the reaction.
b) The equation for the reaction of alcohol A (let's assume it's ethanol, C₂H₅OH) with sodium (Na) is as follows:
C₂H₅OH + 2Na → 2C₂H₅ONa + H₂
c) To find the molecular formula of alcohol A, we need more information about its molecular weight or its empirical formula. Without that information, it is not possible to determine the exact molecular formula.
B)
a) The relative density of compound B is 1.93 with respect to air, which indicates that B is denser than air. This suggests that it might be a volatile liquid or a solid. Without further information, it is not possible to determine the molecular formula of compound B accurately.
Regarding compound C, it is stated that it is the only one containing an oxygen atom. However, there is no given information about its relative density or any other characteristics that could help determine the molecular formula.
Without more specific data, it is not possible to determine the molecular formulas of compounds B and C accurately.
You're welcome! If you have any more questions, feel free to ask!
a) To determine the gas released in the reaction, you need to consider the stoichiometry of the reaction. From the given information, we know that 9.8g of alcohol A completely reacts with an excess of sodium. We need to find the molar mass of alcohol A and compare it to the molar mass of the gas released.
1. Convert the mass of alcohol A to moles:
Moles of A = Mass of A / Molar mass of A
2. Use the balanced equation to determine the stoichiometry of the reaction. From the reaction, we should be able to determine the ratio of moles of alcohol A to moles of gas released.
3. Compare the molar mass of the gas to known molar masses of gases. By comparing the molar mass of the gas to the molar mass of different gases, we can identify which gas was produced in the reaction.
b) To write the equation of the reaction of alcohol A with sodium, we need to understand the properties of alcohol and sodium when they react.
Let's assume that the alcohol A is ethanol (C2H5OH) for the purpose of demonstration. Ethanol reacts with sodium (Na) to produce sodium ethoxide (CC2H5ONa) and hydrogen gas (H2) as follows:
C2H5OH + 2Na -> 2C2H5ONa + H2
To determine the exact equation, it would require more information on the molecular structure and formula of alcohol A.
c) To find the molecular formula of alcohol A, we need more information. The given data does not provide enough details about the molecular structure or elemental composition of alcohol A. Without additional data, it is not possible to determine the molecular formula of alcohol A.
B) To determine the molecular formulas of compounds B and C, we need to consider the information given about their properties.
From the given data, we know that the dehydration of alcohol A in the presence of sulfuric acid produces two compounds, B and C. Additionally, only compound C contains an oxygen atom.
1. Since compound C contains an oxygen atom, it is likely an organic compound with a functional group such as an aldehyde, ketone, or carboxylic acid.
2. Compound B has a relative density with respect to air equal to 1.93. Relative density is the ratio of the density of a substance compared to the density of air. By knowing the relative density, we can estimate the molar mass of compound B and possibly determine its molecular formula.
However, without further information about the properties and characteristics of compounds B and C, it is not possible to determine their molecular formulas accurately.
Please note that without detailed data or additional information, it can be challenging to provide a definitive answer. Scientific experiments and analysis are typically required to determine the exact molecular formulas and identities of compounds.