2/13/08

LAB PRACTICE QUIZ ANSWERS

Pressure (mm Hg)
766.54 (20 x .077 + 765)
770.39 (70 x .077 + 765)
777.32 (160 x .077 + 765)
783.48 (240 x .077 + 765)
788.87 (310 x .077 + 765)
795.8 (400 X .077 + 765)

Volume (mL)*see below
507.88 (30 + 477.88)
502.88 (25 + 477.88)
497.88 (20 + 477.88)
492.88 (15 + 477.88)
487.88 (10 + 477.88)
482.88 (5 +477.88)

*where did 477.88 come from?
step 1) pi x radius squared x length of the capillary tube = volume of the capillary tube
3.14 x .0625 x 21= 4.12
step 2) volume of the flask - volume DBP - volume of tube = volume of air in flask
532 - 50 - 4.12 = 477.88
step 3) volume of air in the syringe + volume of air in flask = total volume of air in apparatus
(30 + 477.88), (25 + 477.88), (20+ 477.88)...

1/31/08

1) 20.0 moles of chlorine

2) a) 1.2E24 + 6.02E23 --> 1.2E24
b) 2 mol + 1 mol --> 2 mol
c) 48.6 gMg + 32 g oxygen --> 80.6 g magesium oxide
d) 22.4 L of Oxygen

3) a) 3.6E24 + 1.2E24 --> 1.2E24 + 1.8E24
b) 6 mol + 2 mol --> 2 mol + 3 mol
c) 138 + 196 --> 328 + 6
d) 67.2 L Hydrogen

4) 27.6 L of oxygen

5) 5.04E25 particles Na(OH)

6) 14.26g --> 14.24g

12/7/07

Odd numbers on Mole #2 Worksheet

12/6/07

Finish the worksheet for the people who were talking in class.

#1-10 for everyone else.

12/5/07

NONE

12/3/07

NONE

11/30/07

KCP page 302