summer 2008 mid2

summer 2008 mid2 - 2100 exam I page 1/10 ChBE 2100 Chemical...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
2100 exam I page 1/10 ChBE 2100 Chemical Process Principles Summer 2008 Exam 2 There are 4 problems, each worth 25 points. There are some tables at the end of the exam that you may find useful. Please read the questions carefully. This exam is closed-book. However, you are allowed one 8.5" x 11" piece of paper (one side only) with any information you want on it. These notes must be your own and may not be copied from another person. All other relevant information is provided. The use of wireless devices (e.g. cell phones, IR transmitters/receivers) is not permitted. The use of programmable calculators is only allowed if all relevant content has been erased from the calculator memory and the programmable features are not used. To receive full credit on each problem, it is advised to start with the appropriate full form of the balance equation(s) needed to solve the problem. Label all variables and equations. Include a brief word description to explain each step in your problem if appropriate. State all your assumptions clearly. Present your solution clearly. Numerical answers without units or explanations will not receive credit. Name: _ (Please write your name on the back of the last page of the exam too) The work presented here is solely my own. I did not receive any assistance nor did I assist other students during the exam. I pledge that I have abided by the above rules and the Georgia Tech Honor Code. Signed: _ ____--'/25 Problem 1 ____. ...:125 Problem 2 Problem 3 Problem 4 Total ____---'/100
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2100 exam I page 2/10 Problem 1 (25 points) Acetone is added to a sealed mixing vessel containing acetonitrile and nitromethane. After coming to equilibrium at 80°C, the liquid phase is found to contain 25 mol% acetone, 35 mol% acetonitrile and 40 mol% nitromethane,. Calculate the pressure in the vessel and the vapor composition. ___ kPa --- % acetone % acetonitrile ___ % nitromethane Data: Antoine constants (where temperature is in °C and vapor pressure is in kPa) acetone acetonitrile nitromethane A 6.3174 6.1984 6.1688 B 1277.03 1279.20 1291.01 C 237.22 224.00 209.00 9\>\'0 \ <i,~' 0 \-lLh'O <;"0) I
Background image of page 2
--- 2100 exam I page 3/10 Problem 2 (25 points) Air at 32°C and 70% relative humidity enters a first chamber, in which it is cooled by spraying it with cold water. It leaves that chamber saturated with water and at an unspecified temperature. The air then enters a second chamber, in which it is warmed to 25°C and has a relative humidity of 55%. No water is added or removed in the second chamber. The whole process occurs at 1 atm. (Hint: the molecular weight of air is 29.0 g/mol) (i) What is the temperature of the air leaving the first chamber? DC (ii) How much water vaporizes into or condenses from (specify which) each kilogram of dry air in the first chamber? ___kg water I kg dry air vaporized condensed (circle one) to\o'O- S\
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2100 exam I page 4/10 Problem 3 (25 points) n-Hexane is burned with excess air. An analysis of the product gas yields the follow dry-basis molar compositions: 82.1 % N 2 6.9% CO 2 2.1 % CO, 8.6% O 2 , and 0.265% C e H 14 .
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 10

summer 2008 mid2 - 2100 exam I page 1/10 ChBE 2100 Chemical...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online