Calculate the Entropy of Vaporization of Ethanol, C₂H₅OH, at 298

question 9

Multiple Choice

Calculate the entropy of vaporization of ethanol, C₂H₅OH, at 298 K from the following data. The constant-pressure molar heat capacities of ethanol as liquid and vapour are 111.46 and 65.44 J K^-1 mol^-1 respectively. The enthalpy of vaporization of ethanol at its boiling temperature, 352 K, is 38.56 kJ mol^-1.

• A) +117.21 J K^-1 mol^-1
• B) +139.01 J K^-1 mol^-1
• C) +109.55 J K^-1 mol^-1
• D) +29.46 J K^-1 mol^-1

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Definitions:

Equilibrium Price

The market price at which the supply of an item equals the quantity demanded.

Equilibrium Quantity

The volume of goods or services that are both presented and required at the price where supply meets demand in a market.

Quantity Demanded

Refers to the total amount of a good or service that consumers are willing to purchase at a given price.

Demand Curve

A chart that illustrates how the quantity of a product demanded is related to its price.