2. Atoms & Elements

Mole Concept

Multiple Choice
How many moles are present in 199 grams of CCl_4?
80
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Multiple Choice
How many molecules are present in 4.00 moles of glucose (C_6H_{12}O_6)?
131
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Multiple Choice
How many moles are present in 22 grams of argon (Ar)? (Atomic mass of Ar = 39.95 g/mol)
71
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Multiple Choice
A sample contains 18.0 g of water (H_2O). What is the number of moles present in the sample?
76
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Open Question
How many sodium ions are contained in 99.6 mg of Na₂SO₃? The molar mass of Na₂SO₃ is 126.05 g/mol.
1623
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Multiple Choice
Which value approximately represents the number of atoms in one mole of gold?
82
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Multiple Choice
How many xenon atoms are present in 2.36 moles of xenon (Xe)?
88
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Multiple Choice
How many atoms are present in a 24 g sample of carbon (atomic mass = 12 g/mol)?
95
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Multiple Choice
How many sodium atoms are present in 0.2310 g of sodium (Na)?
71
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Multiple Choice
How many grams of glucose (C6H12O6) are present in 3.55 moles of glucose?
101
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Multiple Choice
How many moles are present in 3.01 × 10^{22} atoms of magnesium (Mg)?
82
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Multiple Choice
1 mole of which of the following substances contains the largest number of atoms?
72
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Multiple Choice
How many moles are present in 8.50 × 10^{24} molecules of sodium sulfate (Na_2SO_4)?
16
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Open Question
How many atoms are present in 0.375 mol of palladium (Pd) atoms?
1088
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Multiple Choice
How many grams are present in a sample of calcium (Ca) that contains 2.71 × 10^{20} atoms?
74
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