Multiple Choice
A sample contains 0.25 mol of NaCl. How many formula units of NaCl are present in the sample?
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2. Atoms & Elements
Mole Concept
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In one mole of Be(OH)_2, how many moles of each element (Be, O, and H) are present?
A
1 mole of Be, 1 mole of O, and 2 moles of H
B
2 moles of Be, 2 moles of O, and 2 moles of H
C
1 mole of Be, 2 moles of O, and 1 mole of H
D
1 mole of Be, 2 moles of O, and 2 moles of H
Verified step by step guidance1
Identify the chemical formula of the compound, which is Be(OH)\_2.
Determine the number of atoms of each element in one formula unit of Be(OH)\_2: 1 beryllium (Be), 2 oxygen (O) from the two hydroxide groups, and 2 hydrogen (H) from the two hydroxide groups.
Recall that one mole of a compound contains Avogadro's number of formula units, so the mole ratio of elements in one mole of Be(OH)\_2 is the same as the ratio of atoms in one formula unit.
Therefore, in one mole of Be(OH)\_2, there are 1 mole of Be atoms, 2 moles of O atoms, and 2 moles of H atoms.
Use this mole ratio to answer the question about the number of moles of each element present in one mole of Be(OH)\_2.
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