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Questions and Answers
What is the atomic number of oxygen?
What is the atomic number of oxygen?
- 7
- 9
- 8 (correct)
- 6
What is the molecular formula of oxygen?
What is the molecular formula of oxygen?
- O₃
- O
- O₄
- O₂ (correct)
What is the percentage of oxygen-16 in natural abundance?
What is the percentage of oxygen-16 in natural abundance?
- 95%
- 100%
- 90%
- 99.757% (correct)
What is the boiling point of oxygen?
What is the boiling point of oxygen?
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What is the solubility of oxygen in water?
What is the solubility of oxygen in water?
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Study Notes
Atomic Composition of Oxygen
- Atomic number: 8
- Atomic mass: 15.9994 g/mol
- Electron configuration: 1s² 2s² 2p⁴
- Number of protons: 8
- Number of neutrons: 8 (in the most abundant isotope, oxygen-16)
Molecular Composition of Oxygen
- Molecular formula: O₂
- Molecular mass: 31.9988 g/mol
- Bond type: Covalent double bond
- Bond length: 121 pm (picometers)
- Bond energy: 498 kJ/mol
Isotopes of Oxygen
- Oxygen-16 (99.757% natural abundance)
- Oxygen-17 (0.038% natural abundance)
- Oxygen-18 (0.205% natural abundance)
Properties of Oxygen
- Colorless, odorless, tasteless gas
- Boiling point: -182.96°C
- Melting point: -218.79°C
- Density: 1.429 g/l at 20°C and 1 atm
- Solubility in water: 0.031 mL/mL at 20°C and 1 atm
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