1441final - 1441 Final Review Website...

1441 Final Review
Website: http://dipowell1.home.mindspring.com
NOTICE: This session will be a question and answer session which is different from
past sessions. Please work through these problem before attending, and have your
questions ready. Feel free to come and spend time working problems in room 121.
No formal lecture will be given. If you need to know the date and time, go to the
website and link to review dates.
Dimensional Analysis (Stoichiometric Problems)
1. How many grams of CH
4
are required to produce 43 g of Cu according to the
following equation: 4CuO + CH
4
→ CO
2
+ 2H
2
O + 4Cu?
2. Use the equation below and determine what volume of O
2
at STP is needed to react
with 1.5 moles of C
2
H
4
? C
2
H
4
+ 3O
2
→ 2CO
2
+ 2H
2
O
3. What is the % by mass of chlorine in CH
2
Cl
2
?
4. How many molecules of CH
4
are there in 48.2 g of the compound?
5. How many grams of oxygen are present in 65 g of C
2
H
2
O
2
?
6. A compound is found to contain only C, H and O. It is found to contain the
following weight percents: 70.6% C, 5.9% H , and 23.5% O. The molecular mass of
the compound is 136. What is the molecular formula?
7. Xenon Hexafluoride reacts with water to produce the explosive compound XeO
3
and
hydrogen fluoride. When 3 g of XeF
6
reacted with excess water, 1.2 g of xenon
trioxide was isolated. What is the percent yield?
8. If 4 g of hydrogen and 35 g of oxygen react to form water, how many g of water will
be produced?
Gas Laws
9. Which one of the following gases would deviate the most from ideal gas behavior?
(a) Ne (b) CH
4
(c) H
2
(d) CO
2
(e) SO
2
10. A certain gas has an empirical formula of CH
2
. If 4.2 g of this gas occupies 1.83 L at
100
o
C and 1.00 atm, what is its molecular formula?