
Concept explainers
Interpretation: The given table is to be completed.
Concept introduction: The amount corresponding to any substance or compound can be conveniently evaluated through mole concept. This theory associates the substance’s moles (amount) and its respective molar mass. Mathematically, this relationship is depicted by the formula, Moles=Given mass/Molar mass . The

Answer to Problem 34E
The completetable is as follows.
Mass of Sample | Moles of Sample | Molecules in Sample | Total Atoms in Sample |
4.24 gC6H6 | 0.0543 molC6H6 | 3.27×1022 molecules C6H6 | 3.92×1023 total atoms in C6H6 sample |
4.035 gH2O | 0.224 molH2O | 1.35×1023 molecules H2O | 4.05×1023 total atoms in H2O sample |
1.98 gCO2 | 0.045 molCO2 | 2.71×1022 molecules CO2 | 8.13×1022 total atoms in CO2 sample |
0.297 gCH3OH | 9.264×10−3 molCH3OH | 5.58×1021 molecules CH3OH | 3.35×1022 total atoms in CH3OH sample |
Explanation of Solution
The given mass of benzene (C6H6) is 4.24 g .
The number of moles of C6H6 can be calculated as follows.
Moles=Given massMolar mass (1)
The molar mass of C6H6 is 78.11 g/mol .
Substitute the values in equation (1).
Moles of C6H6=4.24 g78.11 g/mol=0.0543 mol
The number of molecules can be calculated as follows:
Number of molecules=Moles×Avogadro's number (2)
The value of Avogadro’s number is 6.023×1023 mol−1 .
Substitute the values in equation (2).
Number of molecules=Moles×6.023×1023 mol−1(3)
Substitute the respective values in equation (3).
Number of C6H6 molecules=0.0543 mol×6.023×1023 mol−1=3.27×1022
The number of atoms can be calculated as follows.
Total atoms=Atoms per molecule×Total molecules (4)
The total number of atoms in C6H6 is 12 .
Substitute the respective values in equation (4).
Total atoms in C6H6=12×3.27×1022=3.92×1023
The given moles of water (H2O) are 0.224 mol .
The molar mass of water is 18.015 g/mol .
The mass of water can be calculated using equation (1) as follows.
0.224 mol=Mass of H2O18.015 g/molMass of H2O=0.224 mol×18.015 g/molMass of H2O=4.035 g
The number of molecules of H2O can be calculated using equation (3) as follows.
Number of H2O molecules=0.224 mol×6.023×1023 mol−1=1.35×1023
The number of atoms in H2O molecule are 3 .
The total number of atoms in H2O can be calculated using equation (4) as follows.
Total atoms in H2O=3×1.35×1023=4.05×1023
The given number of molecules of CO2 are 2.71×1022 .
The number of moles of CO2 can be calculated using equation (3) as follows.
2.71×1022=Moles of CO2×6.023×1023 mol−1Moles of CO2=2.71×10226.023×1023 mol−1Moles of CO2=0.045 mol
The molar mass of CO2 is 44.01 g/mol .
The mass of CO2 can be calculated using equation (1) as follows.
0.045 mol=Mass of CO244.01 g/molMass of CO2=0.045 mol×44.01 g/molMass of CO2=1.98 g
The number of atoms in CO2 molecules are 3 .
The total atoms in CO2 can be calculated using equation (4) as follows.
Total atoms in CO2=3×2.71×1022=8.13×1022
The given total number of atoms in CH3OH is 3.35×1022 atoms.
The number of atoms in CH3OH molecule are 6 .
The total number of molecules in CH3OH can be calculated using equation (4) as follows.
3.35×1022 atoms=6 atoms×Total molecules in CH3OHTotal molecules in CH3OH=3.35×1022 atoms6 atomsTotal molecules in CH3OH=5.58×1021
The number of moles of CH3OH can be calculated using equation (3) as follows.
5.58×1021=Moles of CH3OH×6.023×1023 mol−1Moles of CH3OH=5.58×10216.023×1023 mol−1Moles of CH3OH=9.264×10−3 mol
The molar mass of CH3OH is 32.04 g/mol .
The mass of CH3OH can be calculated using equation (1) as follows.
9.264×10−3 mol=Mass of CH3OH32.04 g/molMass of CH3OH=9.264×10−3 mol×32.04 g/molMass of CH3OH=0.297 g
Therefore, the complete table is as follows.
Mass of Sample | Moles of Sample | Molecules in Sample | Total Atoms in Sample |
4.24 gC6H6 | 0.0543 molC6H6 | 3.27×1022 molecules C6H6 | 3.92×1023 total atoms in C6H6 sample |
4.035 gH2O | 0.224 molH2O | 1.35×1023 molecules H2O | 4.05×1023 total atoms in H2O sample |
1.98 gCO2 | 0.045 molCO2 | 2.71×1022 molecules CO2 | 8.13×1022 total atoms in CO2 sample |
0.297 gCH3OH | 9.264×10−3 molCH3OH | 5.58×1021 molecules CH3OH | 3.35×1022 total atoms in CH3OH sample |
The complete table for the given amount of substances is given above.
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Chapter 3 Solutions
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