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, we find the total mass of 1,8-cineole in a 500 cm³ bottle:

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

We convert mg to kg:

$460\,\text{mg} = 0.00046\,\text{kg}$

Next, we calculate the cost of 460 mg of 1,8-cineole:

Cost of 1 kg of 1,8-cineole = £59.10 = £0.05910 per gram = £0.05910 × 1000 = £59.10 per kg.

Cost of 0.00046 kg:

$0.00046\,\text{kg} \times £59.10 = £0.027166$

Converting to pence (1 pound = 100 pence):

Cost in pence = £0.027166 × 100 ≈ 2.72 pence.

The chiral carbon atom in the linalool structure is the carbon atom that is connected to four different groups, specifically the carbon atom that is bonded to the –OH group, –CH₃, –H and the remaining carbon chain.

The molecular formula of farnesene, which consists of three isoprene units, can be represented as (C_{15}H_{24}) or (C_{5}H_{8} ) when considering the connection between isoprene units.