Asked in PMC Practice Test 18 (2021) 2021

The number of atoms present in a molecule determines it's:

Correct answer: D. Atomicity

  • A. Shape
  • B. Size
  • C. Molecularity
  • D. Atomicity

Explanation

OPTION A: The shape of a molecule determines its geometry. OPTION B: The size of a molecule tells us how small or big it is. OPTION C: Molecularity is the number of reacting species taking part in an elementary reaction that must collide simultaneously to bring about a chemical reaction.OPTION D: The number of atoms present in a molecule of an element is called its atomicity. Hence, D is the correct option

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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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