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2007 Fall midterm 2

# 2007 Fall midterm 2 - 2100 exam II page 1/12 ChBE 2100...

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2100 exam II page 2/12 Problem I (25 points) a. (3 points) A sealed vessel contains only acetone. Identify which phase(s) can be present for the following situations (circle the correct answer(s». The pressure is slightly less than the vapor pressure. liquid gas/vapor The pressure equals the vapor pressure. liquid gas/vapor The pressure is slightly more than the vapor pressure. liquid gas/vapor lJ,'~ I "J~ b. (3 points) A sealed vessel contains only acetone and helium. Identify which phase(s) ca:e preser for the following situations (circle the correct answer(s». There are 5 degrees of superheat. liquid gas/vapor The vapor phase is saturated. liquid gas/vapor The pressure is slightly less than the vapor pressure of acetone liquid gas/vapor N' I "/t~ ~ I f\IG c. (3 points) After an ice storm (in other parts of the country), salt is poured onto the Ice. Sin p s from this class, explain why salt helps make the ice melt faster in 1 or 2 sentences.
2100 exam II page 3/12 d. (16 points) You have a sealed vessel at equilibrium at 1 atm and 80 °C. Answer the following questions and be sure to show/explain your work when quantitative answers are needed. The vessel contains only water. Is there a liquid phase present? Yes No If yes, what is the composition of the liquid phase (i.e., mole fractions of each species)?

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