Which of the following pair of gases possesses equal volume at STP:
Correct answer: D. 0.5 mole of NO and 16 g O2
- A. 44g CO2 and 44g CO
- B. 16g O2 and 32g CH4
- C. 3.01 x 10^23 molecules of CO and 3.01 x 10^23 gram molecules of H2
- D. 0.5 mole of NO and 16 g O2
Explanation
Equal volumes of all ideal gases at same temperature and pressure contain equal number of moles and molecules. Both 0.5 mole of NO and 16 g (0.5 mole) O2 have same number of moles. Therefore, they have equal volume at STP.
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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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