Ichthyothereol is isolated from the leaves of Ichthyothere terminalis. It is so toxic to fish that they will jump out of the wat
er if any leaves from this plant are used as bait. It is also used by the indigenous people of the Amazon for poisoned arrowheads. How many stereoisomers are possible for ichthyothereol?
1 answer:
Answer:
See the explanation
Explanation:
We have to start by analyzing the molecule. In the molecule, we have <u>two types of isomerism</u>. In the double bond, we can have <u>E or Z isomerism</u>, and additionally, we have a <u>chiral carbon</u> (a carbon with 4 different bonds) (See figure 1). With this in mind, we can have <u>4 possible isomers</u>.(See figure 2).
<u>a) (3S)-2-(E)-ichthyothereol</u>
<u>b) (3R)-2-(E)-ichthyothereol</u>
<u>c) (3R)-2-(E)-ichthyothereol</u>
<u>d) (3R)-2-(Z)-ichthyothereol</u>
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The enthalpy of reaction for the combustion of ethane 2CH₃CH₃ + 7O₂ → 4CO₂ + 6H₂O calculated from the average bond energies of the compounds is -2860 kJ/mol.
The reaction is:
2CH₃CH₃ + 7O₂ → 4CO₂ + 6H₂O (1)
The enthalpy of reaction (1) is given by:
(2)
Where:
r: is for reactants
p: is for products
The bonds of the compounds of reaction (1) are:
- 2CH₃CH₃: 2 moles of 6 C-H bonds + 2 moles of 1 C-C bond
- 7O₂: 7 moles of 1 O=O bond
- 4CO₂: 4 moles of 2 C=O bonds
- 6H₂O: 6 moles of 2 H-O bonds
Hence, the enthalpy of reaction (1) is (eq 2):
Therefore, the enthalpy of reaction for the combustion of ethane is -2860 kJ/mol.
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