CHM110H5 Study Guide - Final Guide: Concentration Cell, Joule, Sodium Hydroxide

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4 Apr 2017
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Chemistry Exam Jam Review Lecture
Thursday, December 3, 2015
10:00 AM
Exam Reminders:
o3 hours
o9 questions, answer only 8
Answer 9 and choose 8 best
Have to circle question that you don't want counted
oEach question should take 20 minutes approximately
160 for 8 questions, 180 for all 9
oStart with topics you know
oIf you don't get the question in 20 minutes then move on to next
question
Practice Problems
oPPT1 (Unit 1) Problem 2
Find m (molE/kgW)
XE = nE/nE + nW = 0.05
XW = nW/nE + nW = 0.95
XE/XW = nE/nW = 0.05/0.95 = 1/19
nW = 19nE
1000gW/(18g/molW) = 55.5 mol
REMEMBER THIS ^
nE = nW/19 = 55.5/19 = 2.92 mol
2.92 molE/kgW
Find M (molE/LSolution)
d = 0.997 g/mL --> 977g/LSolution
977g = massE + massW = 46nE + 18nW = 46nE + 18(19nE)
nE = 2.57
2.57 molE/LSolution
oPPT 1 (Unit 1) Problem 6
(35g HCl/100g sol)(1.20g sol/mL sol)(1000mL/L sol)(1 mol
HCl/36.5g HCl) = 11.5M
(11.5mol HCl/L sol) = (x mol HCl/0.175 L sol)
X = 2.012 mol, [HCl] = 2 M
KOH + HCl --> K+ + Cl- + H2O
1 HCl reacted
K2CO3 + 2 HCl --> 2K+ + 2Cl- + CO2 + H2O
2 HCl reacted
KCl + HCl --> N.R.
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