The number of atoms in a molecule determines________________?
Correct answer: D. atomicity
- A. macromolecule
- B. macromolecule
- C. molecularity
- D. atomicity
Explanation
Atomicity is the number of atoms present in one molecule of an element or compound, such as two atoms in O2 or three atoms in O3. Molecularity instead describes the number of reacting species in an elementary reaction, not the atoms in a molecule. The duplicated macromolecule options may attract students who confuse large molecules with the definition of atomicity.
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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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