Concept explainers
Complete the following table.
l>
Mass of Sample | Moles of Sample | Atoms in Sample |
5.00 g AI |
td>
td>
msp;
td>
msp;
msp;
Interpretation:
The given table should be completed.
Mass of sample | Moles of sample | Atoms in sample |
5.00 g Al | ||
0.00250 mol Fe | ||
0.00250 g Mg | ||
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 84AP
Mass of sample | Moles of sample | Atoms in sample |
5.00 g Al | 0.185 mol Al | |
0.14 g Fe | 0.00250 mol Fe | |
273.75 g Cu | 4.3 mol Cu | |
0.00250 g Mg | 0.00010 mol Mg | |
0.0621 g Na | ||
Explanation of Solution
Mass of aluminium is 5 g and molar mass of Al is 26.98 g/mol thus, number of moles can be calculated as follows:
Since, 1 mol of a substance contains
Number of moles of iron is 0.00250 mol and molar mass of Fe is 55.845 g/mol thus, mass can be calculated as follows:
Putting the values,
Since, 1 mol of a substance contains
Number of atoms of copper is
Since, 1 mol of a substance contains
Molar mass of copper is 63.546 g/mol thus, mass of copper is:
Mass of magnesium is 0.00250 g and molar mass of Mg is 24.305 g/mol thus, number of moles can be calculated as follows:
Since, 1 mol of a substance contains
Number of moles of sodium is
Putting the values,
Since, 1 mol of a substance contains
Number of atoms of uranium is
Since, 1 mol of a substance contains
Molar mass of uranium is 238.023 g/mol thus, mass of uranium is:
The complete table is as follows:
Mass of sample | Moles of sample | Atoms in sample |
5.00 g Al | 0.185 mol Al | |
0.14 g Fe | 0.00250 mol Fe | |
273.75 g Cu | 4.3 mol Cu | |
0.00250 g Mg | 0.00010 mol Mg | |
0.0621 g Na | ||
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Chapter 8 Solutions
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