Mathematics for Elementary Teachers with Activities (5th Edition)
5th Edition
ISBN: 9780134392790
Author: Beckmann, Sybilla
Publisher: PEARSON
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Textbook Question
Chapter 16.4, Problem 3P
Use fraction arithmetic to solve problem 1 on page 741 of Section 16.3. Explain why you can use fraction arithmetic to solve this problem.
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Question 1:
If a barometer were built using oil (p = 0.92 g/cm³) instead of mercury (p =
13.6 g/cm³), would the column of oil be higher than, lower than, or the same as the
column of mercury at 1.00 atm? If the level is different, by what factor? Explain. (5 pts)
Solution:
A barometer works based on the principle that the pressure exerted by the liquid column
balances atmospheric pressure. The pressure is given by:
P = pgh
Since the atmospheric pressure remains constant (P = 1.00 atm), the height of the
liquid column is inversely proportional to its density:
Step 1: Given Data
PHg
hol=hgx
Poil
• Density of mercury: PHg = 13.6 g/cm³
Density of oil: Poil = 0.92 g/cm³
• Standard height of mercury at 1.00 atm: hμg
Step 2: Compute Height of Oil
= 760 mm = 0.760 m
13.6
hoil
= 0.760 x
0.92
hoil
= 0.760 × 14.78
hoil
= 11.23 m
Step 3: Compare Heights
Since oil is less dense than mercury, the column of oil must be much taller than that of
mercury. The factor by which it is taller is:
Final…
Question 3:
A sealed flask at room temperature contains a mixture of neon (Ne) and nitrogen (N2)
gases.
Ne has a mass of 3.25 g and exerts a pressure of 48.2 torr.
.
N2 contributes a pressure of 142 torr.
• What is the mass of the N2 in the flask?
• Atomic mass of Ne = 20.1797 g/mol
• Atomic mass of N = 14.0067 g/mol
Solution:
We will use the Ideal Gas Law to determine the number of moles of each gas and
calculate the mass of N2.
PV = nRT
where:
• P = total pressure
•
V volume of the flask (same for both gases)
n = number of moles of gas
•
R 0.0821 L atm/mol K
• T = Room temperature (assume 298 K)
Since both gases are in the same flask, their partial pressures correspond to their mole
fractions.
Step 1: Convert Pressures to Atmospheres
48.2
PNe
= 0.0634 atm
760
142
PN2
=
= 0.1868 atm
760
Step 2: Determine Moles of Ne
nNe =
mass
molar mass
3.25
nNe
20.1797
nne 0.1611 mol
Step 3: Use Partial Pressure Ratio to Find n
Chapter 16 Solutions
Mathematics for Elementary Teachers with Activities (5th Edition)
Ch. 16.1 - Some games have spinners. When the arrow in a...Ch. 16.1 - a. Draw a spinner such that the probability of...Ch. 16.1 - a. Draw a 4-color spinner (red, green, yellow,...Ch. 16.1 - Write a paragraph discussing the following: a....Ch. 16.1 - A family math night at school features the...Ch. 16.1 - There are 50 small balls in a tub. Some balls are...Ch. 16.1 - In a classroom, there are l00 plastic fish in a...Ch. 16.1 - There is a bag filled with 4 red blocks and 16...Ch. 16.1 - Write several paragraphs in which you describe and...Ch. 16.2 - A bakery makes 4 different kinds of cake. Each...
Ch. 16.2 - Allie and Betty want to know how many 3-letter...Ch. 16.2 - Explain your answers to the following: a. How many...Ch. 16.2 - In all 3 parts in this problem, explain your...Ch. 16.2 - Most Georgia car license plates currently use the...Ch. 16.2 - a. A 40-member club will elect a president and...Ch. 16.2 - A dance club has 10 women and 10 men. In each of...Ch. 16.2 - A pizza parlor problem. How many different large...Ch. 16.2 - A pizza parlor offers lo different toppings to...Ch. 16.3 - A children’s game has a spinner that is equally...Ch. 16.3 - A children’s game has a spinner that is equally...Ch. 16.3 - A children’s game has a spinner that is equally...Ch. 16.3 - A children’s game has a spinner that is equally...Ch. 16.3 - A children’s game has a spinner that is equally...Ch. 16.3 - Determine the probability of spinning a blue...Ch. 16.3 - Determine the probability of spinning a blue...Ch. 16.3 - Determine the probability of spinning a red...Ch. 16.3 - Suppose you have a penny, a nickel, a dime, and a...Ch. 16.3 - You have a bag containing 2 yellow and 3 blue...Ch. 16.3 - There are 3 plastic bears in a bag. The teacher...Ch. 16.3 - There are 4 black marbles and 5 red marbles in a...Ch. 16.3 - Suppose you have 100 light bulbs and one of them...Ch. 16.3 - A game at a fund-raiser: There are 20 rubber ducks...Ch. 16.3 - You are making up a game for a fund-raiser. You...Ch. 16.3 - a. A waitress is serving 5 people at a table. She...Ch. 16.3 - Prob. 17PCh. 16.3 - Prob. 18PCh. 16.4 - A children’s game has a spinner that is equally...Ch. 16.4 - Suppose you flip a coin and roll a number cube...Ch. 16.4 - Use fraction arithmetic to solve problem 1 on page...Ch. 16.4 - Use fraction arithmetic to solve problem 3 on page...Ch. 16.4 - Use fraction arithmetic to solve problem 6 on page...Ch. 16.4 - Prob. 6PCh. 16.4 - Use fraction arithmetic to solve problem 8 on page...Ch. 16.4 - There are 3 boxes, one of which contains 2...Ch. 16.4 - A game consists of spinning a spinner and then...Ch. 16.4 - Prob. 10PCh. 16.4 - Prob. 11PCh. 16.4 - Prob. 12PCh. 16.4 - Prob. 13PCh. 16.4 - Prob. 14PCh. 16.4 - Suppose you have 2 boxes, 50 black pearls and 50...Ch. 16.4 - Due to its high population, China has a stringent...Ch. 16.4 - The Pretty Flower Company starts plants from seed...Ch. 16.4 - Suppose that ¡n a survey of a large, random group...Ch. 16.4 - Suppose that 1% of the population has a certain...
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