# Help on a chemistry a level question

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#1
(b) Hex-1-ene is a liquid with a boiling point of 63°C and a density of 0.67gcm–3.
Hex-1-ene can be prepared by refluxing hexan-1-ol (boiling point 157 °C) with an acid catalyst. Hexan-1-ol is a liquid with a boiling point of 157°C and a density of 0.82gcm–3.
The equation is shown below.
Hexan-1-ol= Hex-1-ene+ H2O
After reflux, the resulting mixture contains unreacted hexan-1-ol, hex-1-ene and water.
The mixture is then purified.
The expected percentage yield of hex-1-ene from hexan-1-ol is 62.5%. (i)* A student plans to prepare 4.20 g of hex-1-ene by this method.
Calculate the mass of hexan-1-ol that the student should use and explain how you could obtain pure hex-1-ene from the mixture obtained after reflux.
0
1 year ago
#2
(Original post by Miakat1602)
(b) Hex-1-ene is a liquid with a boiling point of 63°C and a density of 0.67gcm–3.
Hex-1-ene can be prepared by refluxing hexan-1-ol (boiling point 157 °C) with an acid catalyst. Hexan-1-ol is a liquid with a boiling point of 157°C and a density of 0.82gcm–3.
The equation is shown below.
Hexan-1-ol= Hex-1-ene+ H2O
After reflux, the resulting mixture contains unreacted hexan-1-ol, hex-1-ene and water.
The mixture is then purified.
The expected percentage yield of hex-1-ene from hexan-1-ol is 62.5%. (i)* A student plans to prepare 4.20 g of hex-1-ene by this method.
Calculate the mass of hexan-1-ol that the student should use and explain how you could obtain pure hex-1-ene from the mixture obtained after reflux.
1 mole of hexanol reacts with 1 mol of hexene.

Given 4.2g of hexene, find its mole.
Then use the percentage yield formula to find actual yield.

The mole of actual yield will be the mole of hexanol reacted.

Use this to find the mass of hexanol reacted

Pure hexene is obtained by distillation.
0
1 year ago
#3
(Original post by Miakat1602)
(b) Hex-1-ene is a liquid with a boiling point of 63°C and a density of 0.67gcm–3.
Hex-1-ene can be prepared by refluxing hexan-1-ol (boiling point 157 °C) with an acid catalyst. Hexan-1-ol is a liquid with a boiling point of 157°C and a density of 0.82gcm–3.
The equation is shown below.
Hexan-1-ol= Hex-1-ene+ H2O
After reflux, the resulting mixture contains unreacted hexan-1-ol, hex-1-ene and water.
The mixture is then purified.
The expected percentage yield of hex-1-ene from hexan-1-ol is 62.5%. (i)* A student plans to prepare 4.20 g of hex-1-ene by this method.
Calculate the mass of hexan-1-ol that the student should use and explain how you could obtain pure hex-1-ene from the mixture obtained after reflux.
Hi,
I have the problem answering the same problem, and I still can't figure it out, Can you please explain in detail how to solve this question?
0
10 months ago
#4
(Original post by Miakat1602)
(b) Hex-1-ene is a liquid with a boiling point of 63°C and a density of 0.67gcm–3.
Hex-1-ene can be prepared by refluxing hexan-1-ol (boiling point 157 °C) with an acid catalyst. Hexan-1-ol is a liquid with a boiling point of 157°C and a density of 0.82gcm–3.
The equation is shown below.
Hexan-1-ol= Hex-1-ene+ H2O
After reflux, the resulting mixture contains unreacted hexan-1-ol, hex-1-ene and water.
The mixture is then purified.
The expected percentage yield of hex-1-ene from hexan-1-ol is 62.5%. (i)* A student plans to prepare 4.20 g of hex-1-ene by this method.
Calculate the mass of hexan-1-ol that the student should use and explain how you could obtain pure hex-1-ene from the mixture obtained after reflux.
Hi Can u please tell me where you got this question from?

I'll be able to tell you then
0
1 month ago
#5
(Original post by Miakat1602)
(b) Hex-1-ene is a liquid with a boiling point of 63°C and a density of 0.67gcm–3.
Hex-1-ene can be prepared by refluxing hexan-1-ol (boiling point 157 °C) with an acid catalyst. Hexan-1-ol is a liquid with a boiling point of 157°C and a density of 0.82gcm–3.
The equation is shown below.
Hexan-1-ol= Hex-1-ene+ H2O
After reflux, the resulting mixture contains unreacted hexan-1-ol, hex-1-ene and water.
The mixture is then purified.
The expected percentage yield of hex-1-ene from hexan-1-ol is 62.5%. (i)* A student plans to prepare 4.20 g of hex-1-ene by this method.
Calculate the mass of hexan-1-ol that the student should use and explain how you could obtain pure hex-1-ene from the mixture obtained after reflux.
0
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