Chemistry: Matter and Change

Chapter 10: The Mole

Chapter Test Practice

1
If each image represents one mole of the substance pictured, which contains the greatest amount of substance?

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A)molecules
B)atoms
C)formula units
D)none; all amounts are the same
2
The sucrose molecule is a large and complex molecule built of carbon, hydrogen, and oxygen. How many sucrose molecules in 0.5 moles of sucrose?

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A)6.02 x 1023
B)1.20 x 1024
C)3.01 x 1023
D)1.20 x 1023
3
Radium is a radioactive element that decays into radon gas. Its atomic mass is 226. How many moles in 500 grams of radium?

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A)2.2 moles
B)726 moles
C)3 x 1026 moles
D)0.452 moles
4
The atomic mass of hydrogen-1 is 1.008 and the atomic mass of helium-4 is 4.003. Find the difference in grams between 4 moles of hydrogen and one mole of helium.

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A)0.029 g
B)1.7 x 1022 g
C)0 grams
D)4.81 x10-26 g
5
What is the molar mass of H2CrO4?
A)118 g
B)52 g
C)64 g
D)2 g
6
Acetic acid has the molecular formula CH3COOH. How many atoms of oxygen in 60 grams of acetic acid.

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A)6.0 x 1023 atoms of oxygen
B)1.0 x 1022 atoms of oxygen
C)3.6 x1025 atoms of oxygen
D)1.2 x 1024 atoms of oxygen
7
A sample of liquid contains 0.059% hydrogen and 0.94% oxygen. What is the empirical formula?

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A)H2O
B)HO
C)H2O2
D)HO2
8
The empirical formula for a sample of liquid is HO. The molecular weight is 34.0 grams/mole. What is the molecular formula?

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A)H2O
B)HO
C)H2O2
D)HO2
9
A hydrate is a compound that has a specific number of water molecules bound to its atoms. How many water molecules are bound to the hydrate shown in the circle graph?

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A)6
B)7
C)8
D)10
10
What is the best method for removing water from a hydrated compound?
A)freezing
B)filtration
C)distillation
D)heating
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