Concept explainers
Complete the following table.
l>
Mass of Sample | Moles of Sample | Molecules in Sample | Atoms in Sample |
4.24 g |
msp;
msp;
msp;
msp;
td>
msp;
msp;
msp;
Interpretation:
The given table should be completed.
Mass of sample | Moles of sample | Molecules in sample | Atoms in sample |
4.24 g |
|||
0.224 mol |
|||
1.26 mol |
|||
0.297 g |
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 85AP
Mass of sample | Moles of sample | Molecules in sample | Atoms in sample |
4.24 g |
0.0543 mol |
||
4.032 g |
0.224 mol |
||
1.98 g |
|||
45.94 g |
1.26 mol |
||
125.8 g |
6.98 mol |
||
0.297 g |
0.000927 mol |
Explanation of Solution
Mass of
Since, 1 mol of a substance contains
Since, 1 molecule of
Number of moles of
Putting the values,
Since, 1 mol of a substance contains
Since, 1 mole of water molecule contains 3 atoms thus, number of atoms will be:
Number of molecules of
Since, 1 mol of a substance contains
Molar mass of carbon dioxide is 44.01 g/mol thus, mass of carbon dioxide is:
Since, 1 molecule of carbon dioxide contains 3 atoms thus, number of atoms can be calculated as follows:
Number of moles of HCl is 1.26 mol and molar mass of HCl is 36.46 g/mol thus, mass can be calculated as follows:
Putting the values,
Since, 1 mol of a substance contains
Since, 1 mol of HCl contains 2 atoms thus, number of atoms can be calculated as follows:
Number of molecules of
Since, 1 mol of a substance contains
Molar mass of water is 18 g/mol thus, mass of water is:
Since, 1 molecule of water contains 3 atoms thus, number of atoms can be calculated as follows;
Mass of
Since, 1 mol of a substance contains
Since, 1 mol of
The complete table is as follows:
Mass of sample | Moles of sample | Molecules in sample | Atoms in sample |
4.24 g |
0.0543 mol |
||
4.032 g |
0.224 mol |
||
1.98 g |
|||
45.94 g |
1.26 mol |
||
125.8 g |
6.98 mol |
||
0.297 g |
0.000927 mol |
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