2. Atoms & Elements

Mole Concept

Multiple Choice
How many carbon atoms are present in 0.174 moles of carbon?
1069
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Multiple Choice
Which of the following solutions contains the same number of moles of KCl as 75.00 mL of a 0.250 M solution of KCl?
89
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Open Question
The number of hydrogen atoms in 0.050 mol of c3h8o3 is
1468
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Multiple Choice
How many carbon atoms are present in $1$ mole of carbon (i.e., $1 \times N A_{}$ atoms)?
24
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Multiple Choice
One mole of particles of any substance contains how many particles?
70
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Open Question
How many moles of sodium (Na) do you have in a sample of 9.8 × 10²³ atoms Na?
1091
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Multiple Choice
How many moles of sodium carbonate (Na2CO3) contain 1.773 × 10^17 carbon atoms?
1154
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Multiple Choice
How many atoms of Mg, O, and H are present in 3 formula units of Mg(OH)_2?
107
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Multiple Choice
How many atoms are present in one mole of a substance?
81
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Multiple Choice
What is the numerical value of a mole, representing the number of atoms or molecules in one mole of a substance?
76
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Multiple Choice
How many magnesium atoms are present in 1.00 mole of MgO?
99
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Open Question
The mass of 0.550 mol of methanol, CH₃OH, is g (round to three significant figures).
1049
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Multiple Choice
In which field of science is the mole most commonly used as a unit of measurement?
82
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Multiple Choice
How many moles of chloride ions are present in 2 moles of calcium chloride (CaCl_2)?
83
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Multiple Choice
How many molecules are present in 0.500 mole of N_2O_5?
81
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