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Which of the following molecules has highest percentage of oxygen by mas? (1) H2O (2) CO2 (3) CaCO3 (4) C2H5OH?
Most Upvoted Answer
Which of the following molecules has highest percentage of oxygen by m...
Explanation:

To find out which of the given molecules has the highest percentage of oxygen by mass, we need to calculate the mass of oxygen in each molecule and then compare it with the total mass of the molecule.

Calculations:

1. H2O:

- Mass of 2 hydrogen atoms = 2 x 1.008 = 2.016 g/mol
- Mass of 1 oxygen atom = 15.999 g/mol
- Mass of H2O molecule = 2.016 + 15.999 = 18.015 g/mol
- Percentage of oxygen by mass = (15.999/18.015) x 100 = 88.89%

2. CO2:

- Mass of 1 carbon atom = 12.011 g/mol
- Mass of 2 oxygen atoms = 2 x 15.999 = 31.998 g/mol
- Mass of CO2 molecule = 12.011 + 31.998 = 44.009 g/mol
- Percentage of oxygen by mass = (31.998/44.009) x 100 = 72.73%

3. CaCO3:

- Mass of 1 calcium atom = 40.078 g/mol
- Mass of 1 carbon atom = 12.011 g/mol
- Mass of 3 oxygen atoms = 3 x 15.999 = 47.997 g/mol
- Mass of CaCO3 molecule = 40.078 + 12.011 + 47.997 = 100.086 g/mol
- Percentage of oxygen by mass = (47.997/100.086) x 100 = 47.95%

4. C2H5OH:

- Mass of 2 carbon atoms = 2 x 12.011 = 24.022 g/mol
- Mass of 6 hydrogen atoms = 6 x 1.008 = 6.048 g/mol
- Mass of 1 oxygen atom = 15.999 g/mol
- Mass of C2H5OH molecule = 24.022 + 6.048 + 15.999 = 46.069 g/mol
- Percentage of oxygen by mass = (15.999/46.069) x 100 = 34.78%

Conclusion:

From the above calculations, it can be concluded that H2O has the highest percentage of oxygen by mass (88.89%), followed by CO2 (72.73%), CaCO3 (47.95%), and C2H5OH (34.78%).
Community Answer
Which of the following molecules has highest percentage of oxygen by m...
Answer (1) H2O
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Which of the following molecules has highest percentage of oxygen by mas? (1) H2O (2) CO2 (3) CaCO3 (4) C2H5OH?
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