One molecule of oxygen has the same mass as
Correct answer: D. One atom of Sulphur
- A. 8 moles of O2
- B. 16 moles of H
- C. 2 molecules of CH
- D. One atom of Sulphur
Explanation
One molecule of oxygen (O2) has a molecular mass of approximately 32 atomic mass units (amu). Therefore, it corresponds to 32 grams per mole. A gram atom of sulfur also has a mass of 32 grams because the atomic mass of sulfur is 32, making it equivalent to one molecule of oxygen in terms of mass. The other options are incorrect because they either involve incorrect mole-to-mass calculations or involve molecules that do not match the molecular mass of oxygen's single molecule.
This question appeared on the KMU MDCAT 2023 (retake) paper, which you can sit online with every answer explained.
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About Moles and Avogadro's Number
The mole connects the microscopic number of particles with measurable mass, using Avogadro's number, 6.022 × 10²³ particles per mole. Questions involve molar mass, conversion between mass, moles and particles, percentage composition, empirical and molecular formulas, and distinguishing atoms, molecules, ions and formula units.
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