The number of moles of CO2 which contain 8.0 g of oxygen are:
Correct answer: D. 0.25
- A. 1.0
- B. 4.50
- C. 0.50
- D. 0.25
Explanation
1 mole of CO2 contains 16+16= 32g/mol of oxygen. By the proportion method, for the mass of oxygen to be decreased by 4 times to make it 8.0g, the mole of CO2 should also be reduced by 4 times, which gives us D as the right answer.
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About Fundamental Concepts of Chemistry
Mole calculations connect mass, number of particles and Avogadro's number, while balanced equations provide the mole ratios used in stoichiometry. Questions cover limiting and excess reactants, theoretical yield and percentage yield, including identifying which reactant is consumed first and comparing the actual product with the maximum possible product.
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