Determine the Latent Heat of Vaporization of Unknown Substance X

question 39

Multiple Choice

Determine the latent heat of vaporization of unknown substance X in kcal/g if 4.0 g of boiling liquid X are completely vaporized in 1.2 hours by an input of 15 kcal/h into the system by an energy source.

• A)4.5 kcal/g
• B)1.5 kcal/g
• C)2.7 kcal/g
• D)3.0 kcal/g
• E)5.9 kcal/g

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Definitions:

Price-Elastic

A characteristic of goods or services for which their demand or supply significantly changes with small changes in price.

Mass Transit

Public transportation systems designed to move large numbers of people efficiently via buses, trains, subways, and other modes of transport.

Price Elasticity

A gauge of the responsiveness of the quantity of a good supplied or sought after to fluctuations in its price.