0.5 mole of nitrogen gas and 0.5 mole of carbon monoxide gas at STP have same_____________?
Correct answer: D. Both B and C
- A. Value of a
- B. Mass
- C. Atoms
- D. Both B and C
Explanation
Each sample contains 0.5 mol of molecules, so both have 0.5 x 6.022 x 10^23 = 3.011 x 10^23 molecules. Nitrogen gas gives 0.5 mol x 2 = 1.0 mol of atoms, and carbon monoxide also gives 0.5 mol x 2 = 1.0 mol of atoms, or 6.022 x 10^23 atoms in each sample. Their masses are also equal: 0.5 mol x 28 g mol^-1 = 14 g for N2 and 0.5 mol x 28 g mol^-1 = 14 g for CO.
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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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