Styrene, C₈H₈, Is One of the Substances Used in the Production

question 11

Multiple Choice

Styrene, C₈H₈, is one of the substances used in the production of synthetic rubber.When styrene burns in oxygen to form carbon dioxide and liquid water under standard-state conditions at 25°C, 42.62 kJ are released per gram of styrene.Find the standard enthalpy of formation of styrene at 25°C. (Given: $\Delta$ H°_f[CO₂(g) ] = -393.5 kJ/mol, $\Delta$ H°_f[H₂O(l) ] = -285.8 kJ/mol, $\Delta$ H°_f[H₂O(g) ] = -241.8 kJ/mol)

• A)147.8 kJ/mol
• B)323.8 kJ/mol
• C)~636.7 kJ/mol
• D)~4249 kJ/mol
• E)~8730 kJ/mol

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Definitions:

Ovule Wall

The protective outer layer of an ovule, which develops into the seed coat upon fertilization.

Seed Coat

The outer protective covering of a seed.

Megaspore

A type of spore in plants that develops into a female gametophyte, involved in the reproductive process.

Sporophyte Generation

The stage in the life cycle of plants and algae where the organism is diploid and generates spores.