2. Atoms & Elements

Mole Concept

Multiple Choice
Which of the following is equal to one mole of calcium atoms?
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Multiple Choice
What is the mass, in grams, of 3.09 × 10^{24} atoms of sulfur (atomic mass = 32.07 g/mol)?
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Multiple Choice
What is the quantity, in moles, of KBr present in 60.0 mL of a 0.150 M KBr solution?
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Multiple Choice
How many moles of carbon atoms are present in 1.22 moles of C6H12O6?
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Multiple Choice
What is the quantity, in moles, of NaI present in 175.0 mL of a 0.230 M NaI solution?
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Multiple Choice
Which of the following numerical expressions gives the number of atoms in 2.0 g of Ne (neon)?
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Multiple Choice
How many atoms of H are present in 2.8 mol of N2H4?
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Multiple Choice
How many moles of Na2CO3 are present in 0.40 L of a 3.5 M Na2CO3 solution?
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Multiple Choice
How many atoms are present in one mole of Al_2O_3?
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Multiple Choice
How many moles of iron are present in 3.15 × 10^{24} atoms of iron?
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Multiple Choice
How many moles of oxygen gas (O_2) are present in 33.6 L of the gas at 1 atm and 0°C?
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Multiple Choice
How many moles are present in 36 g of Be (beryllium)? (Atomic mass of Be = 9 g/mol)
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Multiple Choice
In one mole of Sr(HCO3)2, how many moles of each element are present?
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Multiple Choice
If a sample of sodium chloride, NaCl, contains 73.1 kg, what is its number of formula units?
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Multiple Choice
Calculate the number of oxygen atoms found in 783.9 g NiCl₂ • 6 H₂O.
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