The number of moles of CO2 which contains 16 g of oxygen is__________________?
Correct answer: B. 0.5
- A. 0.25
- B. 0.5
- C. 0.75
- D. 1
Explanation
One mole of CO2 contains two moles of oxygen atoms, equal to 2 x 16 g = 32 g of oxygen. Therefore 16 g of oxygen corresponds to 16 g / 32 g per mole of CO2 = 0.5 mole of CO2. Students may choose a by treating 16 g as one mole of CO2, but one mole of CO2 contains 32 g of oxygen, not 16 g.
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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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