Essential oils from the lavender plant are used in aromatherapy - Scottish Highers Chemistry - Question 10 - 2017

The component found in lavender oil A that is missing from lavender oil B is geranyl acetate (peak 5).

First, determine the total amount of 1,8-cineole in a 500 cm³ bottle:

$\text{Amount} = 0.92 \text{ mg/cm}^3 \times 500 \text{ cm}^3 = 460 \text{ mg}$

Next, convert the mass from mg to kg:

$460 \text{ mg} = 0.460 \text{ g} = 0.000460 \text{ kg}$

Using the cost of £59.10 per kg, calculate the cost:

$\text{Cost} = 0.000460 \text{ kg} \times £59.10/\text{kg} \approx £0.027166$

To convert this cost to pence (1 pound = 100 pence):

$0.027166 \times 100 = 2.7166 \text{ pence}$

Rounded to a suitable amount, the cost is approximately 2.72 pence.

In the structure of linalool shown, the chiral carbon atom is the one attached to the hydroxyl (OH) group and is bound to four different groups: H, CH₃, CH₂, and OH. Therefore, it should be circled.

The molecular formula of farnesene is C₁₅H₂₄.