Essential oils from the lavender plant are used in aromatherapy - Scottish Highers Chemistry - Question 10 - 2017
Question 10
Essential oils from the lavender plant are used in aromatherapy.
(a) Gas chromatography can be used to separate and identify the organic compounds in lavender oils.
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Worked Solution & Example Answer:Essential oils from the lavender plant are used in aromatherapy - Scottish Highers Chemistry - Question 10 - 2017
Step 1
Calculate the relative concentration of linalool in lavender oil A.
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Answer
To find the relative concentration of linalool, we use the formula:
Given that the peak area for linalool is 31909 and the total peak area is 79310, we calculate:
Relative concentration of linalool=(7931031909)×100≈40.23%
Step 2
Identify the component found in lavender oil A that is missing from lavender oil B.
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Answer
The component found in lavender oil A but missing from lavender oil B is geranyl acetate, noted as peak 5.
Step 3
Calculate the cost, in pence, of 1,8-cineole that is present in a 500 cm³ bottle of this brand of mouthwash.
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Answer
The concentration of 1,8-cineole in the mouthwash is 0.92 mg/cm³. For a 500 cm³ bottle, the total mass is:
Total mass=0.92 mg/cm3×500 cm3=460 mg
Convert mass to grams (1000 mg = 1 g):
Total mass in grams=1000460=0.46 g
The cost for 1 kg (1000 g) of 1,8-cineole is £59.10. The cost for 0.46 g is calculated as follows:
Cost=100059.10×0.46=£0.027174≈2.72 pence
Step 4
Circle the chiral carbon atom in the linalool structure.
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Answer
In the provided structure of linalool, the chiral carbon is the carbon atom attached to the hydroxyl group (OH) and has four different substituents: a methyl group, an ethyl group, two hydrogen atoms, and the hydroxyl group. It should be circled in the diagram accordingly.
Step 5
Write the molecular formula of farnesene.
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Answer
The molecular formula for farnesene, which consists of three isoprene units, is:
C15H24
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