the questions are related The phase diagram shown is for C_2CI_4 a substand used
ID: 534846 • Letter: T
Question
the questions are related
The phase diagram shown is for C_2CI_4 a substand used in dry cleaning. During the drying cycle, C_2 Cl_4 evaporates at 330 K. Estimate the vapor pressure of this compound under such conditions. A) 0.01 atm B) 0.1 atm C) 0.4 atm D) 1 atm Continuing with the dry cleaning theme, during the drying cycle, clothes soaked in liquid C_2Cl_4 at K at 1 atm tumbled a stream of warm air at 330 K at 1 atm that circ through the basket causing the liquid to evaporate. How do the kinetic energy (K) and potential E (PE) of the molecules in the liquid change during the evaporation? A) K decreases, PE increases B) K remains constant, PE increases C) K increases, PE increases D) K remains the same, PE decreasesExplanation / Answer
Part a:
From the given graph,the pressure corresponding to 330K is 0.1atm.Also,the vapour pressure of C2Cl4 at 300K is 0.02atm so naturally at higher temperature(330K),the vapour pressure will be more than 0.02 atm.Hence answer is B
Part b
When the clothes soaked in C2Cl4 at 300K is exposed to stream of warm air at 330K,the liquid absorbs the heat energy.The bulk of this energy is used to overcome the intermolecular force of attaction i.e to break down the cohesive forces between individual molecules so that they can escape to vapour phase.This causes an increae in potential energy.Since maximum heat energy is utilised to break internal bonds between molecules and not to increase the temperature of liquid,there is neglible rise in kinetic energy as the temperature of liquid remains almost constant.So answer is B
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.