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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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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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Attempt All sub parts from each question.Molecular Perspective In water, there are two types of molecules. Some molecules are at the surface, called exterior molecules, and some molecules are inside, called interior molecules. The interior molecules are attracted to all the molecules around them. The exterior molecules are attracted to only the other surface molecules and to those below the surface. So that the energy state of the molecules on the interior is much lower than that of the molecules on the exterior. The molecules always try to maintain a lower energy state and hence the exterior molecules experience a downward force. This force is known as cohesive force. As a result they try to maintain a minimum surface area, thus allowing more molecules to have a lower energy state. Thus surface tension is created. The water molecules attract one another due to the water molecule’s polar property. The hydrogen ends, which are positive in comparison to the negative ends of the oxygen, cause water to "stick " together. This is why there is surface tension. Water has very high surface tension. It is 72.8 milli newton per meter at 20°C.Q. Surface tension of water is

Attempt All sub parts from each question.Molecular Perspective In water, there are two types of molecules. Some molecules are at the surface, called exterior molecules, and some molecules are inside, called interior molecules. The interior molecules are attracted to all the molecules around them. The exterior molecules are attracted to only the other surface molecules and to those below the surface. So that the energy state of the molecules on the interior is much lower than that of the molecules on the exterior. The molecules always try to maintain a lower energy state and hence the exterior molecules experience a downward force. This force is known as cohesive force. As a result they try to maintain a minimum surface area, thus allowing more molecules to have a lower energy state. Thus surface tension is created. The water molecules attract one another due to the water molecule’s polar property. The hydrogen ends, which are positive in comparison to the negative ends of the oxygen, cause water to "stick " together. This is why there is surface tension. Water has very high surface tension. It is 72.8 milli newton per meter at 20°C.Q. Which one of the following is the correct molecular structure of water molecule?

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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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