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Section 2: Mass and the Mole

Mass and the Mole

1.
How many moles of chlorine are in 100 g chlorine (Cl)?

Element Molar Mass (g/mol)
Hydrogen1.01
Carbon 12.01
Chlorine 35.45


A)0.355
B)2.82
C)64.6
D)100
2.
How many atoms of carbon are in a pure sample of carbon having a mass of 72.0 g?

Element Molar Mass (g/mol)
Hydrogen1.01
Carbon 12.01
Chlorine 35.45


A)3.6 x 1024
B)36 x 1024
C)3.6 x 1023
D)4.33 x 1025
3.
What is the mass of one mole of carbon-12 atoms?
A)12 amu
B)12 grams
C)6 amu
D)6 grams
4.
How many moles of hydrogen are present in 2.0 grams of hydrogen gas?
A)2.0 mol
B)0.5 mol
C)1.0 mol
D)4.0 mol
5.
What is the mass of 5.0 x 1021 molecules of water?
A)8.3 x 10-3 g
B)0.15 g
C)5.0 g
D)6.02 x 1023 g
6.
How many moles of atoms are present in one mole of water?
A)3 mol
B)6 mol
C)1 mol
D)2 mol
7.
How many moles of hydrogen atoms are present in 2.0 moles of ammonia NH(3)?
A)3.0 mol
B)6.0 mol
C)8.0 mol
D)2.0 mol
8.
What is the molar mass of H2CrO4?
A)118 g
B)52 g
C)64 g
D)2 g
9.
How many molecules of ammonia are present in 34.0 g of ammonia NH(3)?
A)1.20 x 1024
B)6.02 x 1023
C)1.77 x 1022
D)34
10.
How is one gram defined?
A)one mole of amu
B)one mole of protons
C)10 moles of amu
D)0.1 mole of amu
11.
A sample of a compound is found to contain 0.404 grams of Fe and 0.174 grams of O. What is the empirical formula for this compound?
A)FeO
B)FeO2
C)Fe2O3
D)Fe3O4
12.
What is the mass of 1.0 x 1012 molecules of O2?
A)1.9 x 1013 g
B)6.0 x 1011 g
C)2.7 x 10-11 g
D)5.3 x 10-11 g
13.
How many moles of C3H8 are present in 451 g C3H8?
A)3.84 mol
B)0.879 mol
C)10.2 mol
D)1.44 mol
14.
Calculate the number of atoms in 4.00 x 10-5 g sodium.
A)1.05 x 1018 atoms
B)3.92 x 1019 atoms
C)3.24 x 1023 atoms
D)5.54 x 1020 atoms
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