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Chcta 10 pdf Chemical Quantities
Communication and Compositon English (Manarat International University)
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Name ___________________________
10
Date ___________________
Class __________________
CHEMICAL QUANTITIES
Chapter Test A
A. Matching
Match each description in Column B to the correct term in Column A. Write the
letter of the correct description on the line.
© Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved.
Column A
Column B
________ 1. standard temperature
and pressure
a. the volume occupied by a mole of any gas at STP
(22.4 L)
________ 2. molar volume
b. the mass in amus of an atom of an element
________ 3. representative particle
c. the number of representative particles in a mole
of a substance
________ 4. molar mass
d. the percent by mass of each element in a compound
________ 5. atomic mass
e. the mass of a mole of a substance
________ 6. Avogadro’s number
f. the formula that gives the lowest whole-number
ratio of the elements in a compound
________ 7. mole (mol)
g. an atom, a formula unit, or a molecule
________ 8. empirical formula
h. the mass in grams of a mole of any pure substance
________ 9. percent composition
i. 6.02 ⫻ 1023 representative particles of a substance
________ 10. molar mass
j. 0°C and 101.3 kPa
B. Multiple Choice
Choose the best answer and write its letter on the line.
________ 11. How many hydrogen atoms are in 4 molecules of isopropyl alcohol,
C3H8O?
a. 4 ⫻ (6.02 ⫻ 1023)
c. 32
b. 4
d. 32 ⫻ (6.02 ⫻ 1023)
________ 12. The mass of a mole of NaCl is its:
a. molar mass.
b. empirical formula.
c. gram atomic mass.
d. atomic mass.
Chapter 10 Chemical Quantities
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Name ___________________________
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Class __________________
________ 13. The chemical formula of aspirin is C9H8O4. What is the mass of
0.200 mol of aspirin?
a. 22.5 g
c. 80 g
b. 5.4 g
d. 36.0 g
________ 14. How many moles of SO3 are in 2.4 ⫻ 1024 molecules of SO3?
a. 0.25
c. 4.0
b. 3.4 ⫻ 1022
d. 2.9 ⫻ 10⫺23
________ 15. What is the volume (in liters at STP) of 2.50 mol of carbon monoxide?
a. 0.112 L
c. 56.0 L
b. 3.10 L
d. 8.96 L
________ 16. The molar mass of molecular oxygen is:
a. equal to the mass of one mole of oxygen atoms.
b. 16.0 g.
c. 32.0 g.
d. none of the above
________ 17. At STP, 1 mol each of hydrogen, oxygen, nitrogen, and fluorine:
a. have different densities.
b. occupy different volumes.
c. are monatomic elements.
d. contain twice Avogadro’s number of representative particles.
________ 18. A large weather balloon filled with helium has a volume of 7.00 ⫻ 102 L
at STP. Which expression should be used to find the mass of helium in
the balloon?
22.4 L/mol
4 g He
c. ᎏᎏ
⫻ ᎏᎏ
7.00 ⫻ 102 L
mol
7.00 ⫻ 102
4 g He
b. ᎏᎏ ⫻ ᎏᎏ
L
mol
7.00 ⫻ 102 L
4 g He
d. ᎏᎏ ⫻ ᎏᎏ
22.4 L/mol
mol
________ 19. The molar mass of a gas can be determined from:
a. the density of the gas at STP.
b. the volume of a mole of the gas.
c. Avogadro’s number.
d. none of the above
________ 20. What is the percent by mass of carbon in acetone, C3H6O?
a. 1.60%
c. 62%
b. 30.0%
d. 20.7%
________ 21. Which of the following is not an empirical formula?
a. Na2SO4
c. N2H4
b. C6H5Cl
d. Sn3(PO4)4
________ 22. Which expression represents the percent by mass of nitrogen in NH4NO3?
14.0 g
80.0 g
c. ᎏᎏ ⫻ 100
a. ᎏᎏ ⫻ 100
80.0 g
14.0 g
28.0 g
b. ᎏᎏ ⫻ 100
80.0 g
254
80.0 g
d. ᎏᎏ ⫻ 100
28.0 g
Core Teaching Resources
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22.4 L
4 g He
a. ᎏᎏ ⫻ ᎏᎏ
mol
mol
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Class __________________
________ 23. A compound has the empirical formula C2H3O and a molar mass of
172 g. What is its molecular formula?
a. C6H9O3
c. C9H16O3
b. C8H12O4
d. C7H8O5
________ 24. The empirical formula of a compound is CH2F. The molar mass of this
compound is 66.0 g. The molecular formula of the compound is:
a. C4H8F4.
c. C2H4F2.
b. C4H4F4.
d. CH2F.
C. Problems
Solve the following problems in the space provided. Show your work.
25. Find the mass, in grams, of 5.00 ⫻ 1023 molecules of F2.
26. The polymer used for the nonstick surface of cooking utensils is 24.0% C and
76.0% F by mass. What is the empirical formula of this polymer?
© Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved.
27. Find the number of moles of argon in 364 g of argon.
D. Essay
Write a short essay for the following.
28. The adjective molar in the phrase molar mass means “of or pertaining to a
mole.” How does this definition support your understanding of molar mass as it
is applied to atoms, molecules, ions, formula units, and other particles?
Chapter 10 Chemical Quantities
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