Concept explainers
Using the
l type='a'>
(a)
Interpretation:
The number of atoms present in the given sample should be calculated.
Concept Introduction:
Number of moles is related to mass and molar mass as follows:
Here, m is mass and M is molar mass.
According to Avogadro’s law, 1 mole of a substance contains
Thus, number of molecules can be calculated from number of moles using the following conversion factor:
Answer to Problem 23QAP
Explanation of Solution
Mass of silver is 1.50 g
First calculate the number of moles as follows:
Molar mass of silver is 107.8682 g/mol thus,
Therefore, number of moles of silver is
According to Avogadro’s law, 1 mole of a substance contains
Number of atoms in 0.014 mol will be:
Thus, number of atoms in silver is
(b)
Interpretation:
The number of atoms present in the given sample should be calculated.
Concept Introduction:
Number of moles is related to mass and molar mass as follows:
Here, m is mass and M is molar mass.
According to Avogadro’s law, 1 mole of a substance contains
Thus, number of molecules can be calculated from number of moles using the following conversion factor:
Answer to Problem 23QAP
Explanation of Solution
Number of moles of copper is 0.0015 mol.
According to Avogadro’s law, 1 mole of a substance contains
Number of atoms in 0.0015 mol will be:
Thus, number of atoms in copper is
(c)
Interpretation:
The number of atoms present in the given sample should be calculated.
Concept Introduction:
Number of moles is related to mass and molar mass as follows:
Here, m is mass and M is molar mass.
According to Avogadro’s law, 1 mole of a substance contains
Thus, number of molecules can be calculated from number of moles using the following conversion factor:
Answer to Problem 23QAP
Explanation of Solution
Mass of copper is 0.0015 g
First calculate the number of moles as follows:
Molar mass of copper is 63.546 g/mol thus,
The number of copper atoms is
According to Avogadro’s law, 1 mole of a substance contains
Number of atoms in
Thus, number of atoms of copper is
(d)
Interpretation:
The number of atoms present in the given sample should be calculated.
Concept Introduction:
Number of moles is related to mass and molar mass as follows:
Here, m is mass and M is molar mass.
According to Avogadro’s law, 1 mole of a substance contains
Thus, number of molecules can be calculated from number of moles using the following conversion factor:
Answer to Problem 23QAP
Explanation of Solution
Mass of magnesium is 2.00 kg
First calculate the number of moles of magnesium as follows:
Molar mass of magnesium is 24.305 g/mol thus,
According to Avogadro’s law, 1 mole of a substance contains
Number of atoms in
Thus, number of atoms of magnesium is
(e)
Interpretation:
The number of atoms present in the given sample should be calculated.
Concept Introduction:
Number of moles is related to mass and molar mass as follows:
Here, m is mass and M is molar mass.
According to Avogadro’s law, 1 mole of a substance contains
Thus, number of molecules can be calculated from number of moles using the following conversion factor:
Answer to Problem 23QAP
Explanation of Solution
Mass of calcium is 2.34 oz
Convert it into grams as using the following conversion factor:
Mass in grams will be:
First calculate the number of moles as follows:
Molar mass of calcium is 40.078 g/mol thus,
Number of moles of calcium is
According to Avogadro’s law, 1 mole of a substance contains
Number of atoms in1.655 mol will be:
Thus, number of atoms of calcium is
(f)
Interpretation:
The number of atoms present in the given sample should be calculated.
Concept Introduction:
Number of moles is related to mass and molar mass as follows:
Here, m is mass and M is molar mass.
According to Avogadro’s law, 1 mole of a substance contains
Thus, number of molecules can be calculated from number of moles using the following conversion factor:
Answer to Problem 23QAP
Explanation of Solution
Mass of calcium is 2.34 g
First calculate the number of moles of calcium as follows:
Molar mass of calcium is 40.078 g/mol thus,
Number of moles of calcium is
According to Avogadro’s law, 1 mole of a substance contains
Number of atoms in
Thus, number of atoms of calcium is
(g)
Interpretation:
The number of atoms present in the given sample should be calculated.
Concept Introduction:
Number of moles is related to mass and molar mass as follows:
Here, m is mass and M is molar mass.
According to Avogadro’s law, 1 mole of a substance contains
Thus, number of molecules can be calculated from number of moles using the following conversion factor:
Answer to Problem 23QAP
Explanation of Solution
Number of moles of calcium is 2.34 mol
According to Avogadro’s law, 1 mole of a substance contains
Number of atoms in 2.34 mol will be:
Thus, number of atoms in calcium is
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Chapter 8 Solutions
Introductory Chemistry
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