CHEN1211Fall05Test3

# CHEN1211Fall05Test3 - SaLtA TI orv5 HOUR EXAM III CHEN 1211...

This preview shows pages 1–3. Sign up to view the full content.

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

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: SaLtA TI orv5 HOUR EXAM III CHEN 1211 Profs. George & Schwartz Tuesday, November 29,2005 6:30PM to 7:30PM Answer all questions on the scantron answer sheet by filling in the proper bubble with a number 2 pencil. If you change your answer, please erase the undesired mark thoroughly. Be sure to fill in the boxes for your student number, name and lab section; then fill in the corresponding bubbles beneath them correctly. A periodic table with atomic numbers and masses is attached to the back of this exam. There are 7 exam pages and 13 questions. Check to be sure you have answered all the questions. Please note the point values of each question. Useful Information: Avogadro's Number = 6.022 x 1023morl Number of Moles = Concentration x Volume Raoult's Law Pso1n= Psolv X Xso1v 1 J = 1 kg m2/s2 1 amu = 1.6605 x 10-24g' First-Order Reaction: [A(t)]/[A(t=O)]= exp(-kt) First-Order Reaction: In[A(t)] =-kt + In[A(t=O)] Half-life for First-Order Equation: t1/2= 0.693/k pH = -log[H+] Kp = Kc(RT)L'1n Ka = [H3O+][A-]/[HA] Kw = [H3O+][OH-] = KaKb = 1.0 x 10-14 Percent Dissociation = ([HA] dissociated / [HA] initial) x 100% Mass Percent = (Mass of component / Total mass of solution) x 100%-b I.Jb2- 4ac x= . 2a 1. (6 Points) Which of the following should be LEAST soluble in water? ((a)'Propane,H3C-CH2-C!lO 'MOS+ ho"-po/~"... r.o fOleA""" bt;'nd..s (b) Acetic acid, H3C-COOH (c) Methanol, H3C-OH (d) Methylamine, H3~NH2 (e) Sodium acetate, CH3-COONa (a) 20.5 mm Hg C(b) 22.1 mm ~g":::> (c) 22.9 mm Hg (d) 24.7 mm Hg (e) 25.6 mm Hg (8 Points) A potassium chloride (KCI) solution is prepared by dissolving 40.0 g' potassium chloride in 250.0 g of water at 25 .C. What is the vapor pressure of the , solutionif the vaporpressureofwi;lterat 25 .C is 23.76mm Hg? / I<: ;!'1,/O '-100°' Kcl. 1,,-,,1 K!:L ;:: ~,J{.blt'iD ~(Jl c./ 15.4-)' 74.)"!'" /j ICCI' I<CI 7¥5£ . . ;SO,O J HzO J ~I ~o ;. /1.87-.t'JI ~() /8. fi2, ~O K C I---";) Ie f-t"tA~)-r c: ,-r",f.) I.() 7:J J.. t:J I II/?!""I..) P....
View Full Document

{[ snackBarMessage ]}

### Page1 / 7

CHEN1211Fall05Test3 - SaLtA TI orv5 HOUR EXAM III CHEN 1211...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online