The number of molecules in 2 moles of carbon dioxide is
Correct answer: D. 1.204 x 10^24
- A. 6.02 x 10^23
- B. 3.01 x 10^23
- C. 44
- D. 1.204 x 10^24
Explanation
Two moles contain 2 x 6.02 x 10^23, which is 1.204 x 10^24 molecules, and this is true for any substance since the mole counts particles rather than mass. The number 44 is the molar mass of carbon dioxide in grams per mole, not a count of molecules. Note that the same 2 moles contain three times as many atoms, because each molecule has three.
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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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