Concept explainers
For each of the following samples of ionic substances, calculate the number of moles and mass of the positive ions present in each sample.
l type="a">
i>6.31 moles of ammonium sulfide,
i>9.71 g of barium phosphide,
i>7.63 moles of calcium phosphate,
(a)
Interpretation:
The number of moles and mass of positive ions present in the 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 51QAP
Number of moles and mass of ammonium ion is 0.03 mol and 0.53 g respectively.
Explanation of Solution
The mass of ammonium iodide
From mass, number of moles can be calculated as follows:
Molar mass of
Thus, number of moles of
From the formula, 1 mol of
From number of moles, mass can be calculated as follows:
Molar mass of ammonium ion is 18.04 g/mol.
Putting the values,
Therefore, number of moles and mass of ammonium ion is 0.03 mol and 0.53 g respectively.
(a)
Interpretation:
The number of moles and mass of positive ions present in the 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:
Number of moles and mass of ammonium ion is 12.64 mol and 228 g respectively.
Number of moles of ammonium sulfide
From the formula, 1 mol of
From number of moles, mass can be calculated as follows:
Molar mass of ammonium ion is 18.04 g/mol.
Putting the values,
Therefore, number of moles and mass of ammonium ion is 12.64 mol and 228 g respectively.
(c)
Interpretation:
The number of moles and mass of positive ions present in the 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:
Number of moles and mass of barium ion is 0.0606 mol and 8.322 g respectively.
Mass of barium phosphide
From mass, number of moles can be calculated as follows:
Molar mass of
Thus, number of moles of
From the formula, 1 mol of
From number of moles, mass can be calculated as follows:
Molar mass of barium ion is 137.327 g/mol.
Putting the values,
Therefore, number of moles and mass of barium ion is 0.0606 mol and 8.322 g respectively.
(d)
Interpretation:
The number of moles and mass of positive ions present in the 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:
Number of moles and mass of calcium ion is 22.89 mol and
Number of moles of calcium phosphate
From the formula, 1 mol of
From number of moles, mass can be calculated as follows:
Molar mass of calcium ion is 40.078 g/mol.
Putting the values,
Therefore, number of moles and mass of calcium ion is 22.89 mol and
Answer to Problem 51QAP
Number of moles and mass of ammonium ion is 12.64 mol and 228 g respectively.
Explanation of Solution
Number of moles of ammonium sulfide
From the formula, 1 mol of
From number of moles, mass can be calculated as follows:
Molar mass of ammonium ion is 18.04 g/mol.
Putting the values,
Therefore, number of moles and mass of ammonium ion is 12.64 mol and 228 g respectively.
(c)
Interpretation:
The number of moles and mass of positive ions present in the 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 51QAP
Number of moles and mass of barium ion is 0.0606 mol and 8.322 g respectively.
Explanation of Solution
Mass of barium phosphide
From mass, number of moles can be calculated as follows:
Molar mass of
Thus, number of moles of
From the formula, 1 mol of
From number of moles, mass can be calculated as follows:
Molar mass of barium ion is 137.327 g/mol.
Putting the values,
Therefore, number of moles and mass of barium ion is 0.0606 mol and 8.322 g respectively.
(d)
Interpretation:
The number of moles and mass of positive ions present in the 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 51QAP
Number of moles and mass of calcium ion is 22.89 mol and
Explanation of Solution
Number of moles of calcium phosphate
From the formula, 1 mol of
From number of moles, mass can be calculated as follows:
Molar mass of calcium ion is 40.078 g/mol.
Putting the values,
Therefore, number of moles and mass of calcium ion is 22.89 mol and
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Chapter 8 Solutions
Student Solutions Manual For Zumdahl/decoste's Introductory Chemistry: A Foundation, 8th Edition
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