Concept explainers
Calculate the number of molecules present in each of the following samples.
oles of sulfur dioxide,
of sulfur dioxide,
:math>
:math>
g of ethane,
(a)
Interpretation:
The number of molecules of substance 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 40QAP
Explanation of Solution
Number of moles of sulfur dioxide,
Since, 1 mole of sulfur dioxxide contains
Therefore, number of molecules in sulfur dioxide is
(b)
Interpretation:
The number of molecules of substance 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 40QAP
Explanation of Solution
Mass of sulfur dioxide is 3.54 g.
Calculate number of moles as follows:
Molar mass of sulfur dioxide is 64.066 g/mol, putting the values,
Since, 1 mole of sulfur dioxide contains
Therefore, number of molecules in sulfur dioxide is
(c)
Interpretation:
The number of molecules of substance 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 40QAP
Explanation of Solution
Mass of ammonia is
Calculate number of moles as follows:
Molar mass of ammonia is 17.031 g/mol, putting the values,
Since, 1 mole of ammonia contains
Therefore, number of molecules in ammonia is
(d)
Interpretation:
The number of molecules of substance 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 40QAP
Explanation of Solution
Number of moles of ammonia is
Since, 1 mole of ammonia contains
Therefore, number of molecules in ammonia is
(e)
Interpretation:
The number of molecules of substance 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 40QAP
Explanation of Solution
Mass of ethane is 1.96 mg.
Convert mass from mg to g as follows:
Molar mass of ethane is 30.07 g/mol. Calculate number of moles of ethane as follows:
Putting the values,
Since, 1 mole of ethane contains
Therefore, number of molecules in ethane is
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Chapter 8 Solutions
Bundle: Introductory Chemistry: A Foundation, 8th + OWLv2 6-Months Printed Access Card
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