What will be the mass of 0.5 moles of CaCO₃?
Correct answer: A. 50 g
- A. 50 g
- B. 55 g
- C. 45 g
- D. 60 g
Explanation
The molar mass of CaCO3 is 40 plus 12 plus 48, which is 100 g per mol, so 0.5 moles has a mass of 0.5 times 100, which is 50 g. The other options come from using an incorrect molar mass.
This question appeared on the UHS MDCAT 2026 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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