Question

Cyclopropane and propylene isomers both have the formula c3h6. based on the molecular structures shown, which of these isomers would you expect to have the higher standard molar entropy at 25 oc

Answer 1

The measure of randomness or uncertainty  of the substance is known as the entropy of the substance.

Under the standard state, the entropy of one mole of substance is known as its standard molar entropy.

The structure of cyclopropane and propylene is shown in the attached image.

Since, the structure of propylene is an open chain structure thus, possessing high randomness. Whereas the structure of cyclopropane is ring (closed) structure and thus, not that much free to move and has less randomness.

Hence, the structure of propylene will have the higher standard molar entropy.

Answer 2

Propylene having an open chain structure has a greater molar entropy than cyclopropane having a closed structure.

Entropy is a measure of the extent of disorder in a system. When a system is more disorderly, the entropy is higher. For a molecule, the degree of restriction of atoms in the molecule affects its entropy.

For open chain structures, there is a greater degree of randomness due to less restriction of atoms in the molecule than closed chain structures. Hence, propylene having an open chain structure has a greater molar entropy than cyclopropane having a closed structure.

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