June 2009 Chemistry Regents #58-59

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Base your answers to questions 58 through 59 on the information below. At a pressure of 101.3 kilopascals and a temperature of 373 K, heat is removed from a sample of water vapor, causing the sample to change from the gaseous phase to the liquid phase. This phase change is represented by the equation below. H2O(g) ==> H2O(l) + heat 58 Explain, in terms of particle arrangement, why entropy decreases during this phase change. [1] HIGHLIGHT TO SEE THE ANSWER The arrangement of the H2O molecules becomes more ordered as liquid water forms. As a liquid, the movement of the particles is less random. 59 Determine the total amount of heat released by 5.00 grams of water vapor during this phase change. [1] HIGHLIGHT TO SEE THE ANSWER ANSWER==>11 300 J Q=mHv=5.00g (2260J/g) Next Questions

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