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How to Calculate Entropy Change.
Chemistry

How to Calculate Entropy Change.

Rosemary Njeri

Entropy is the measure of a system’s thermal energy per unit temperature that is unavailable for doing useful work.

Entropy is also a measure of the molecular disorder, or randomness, of a system as work is obtained from ordered molecular motion.

Entropy is measured in Joules per Kelvin. J/K.

Formula to calculate entropy change.

Calculate Entropy Change.

Q is the heat transfer.

T is the temperature in Kelvin.

Example:

Calculate the entropy of a reaction if the amount of heat transfer is 9200 joules and the temperature change is 274K.

Calculate Entropy Change.

Therefore, the entropy change is 33.7j/K.

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