The one mole of _____molecule has the highest number of atoms?
Correct answer: D. H2C2O4
- A. H2SO4
- B. HClO4
- C. O3
- D. H2C2O4
Explanation
One mole of each compound contains the same number of molecules, so compare atoms in one molecule: H2SO4 has 7 atoms, HClO4 has 6, O3 has 3, and H2C2O4 has 8 atoms. Therefore, 1 mol of H2C2O4 contains 8 mol of atoms, the greatest amount. A common wrong choice is H2SO4 because students may count only the hydrogen and oxygen symbols incorrectly.
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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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