200dm3 of CO is burnt completely according to the reaction 2CO+O2---2CO2What volume of O2 will be required?
Correct answer: A. 100dm3
- A. 100dm3
- B. 50dm3
- C. 60dm3
- D. 70dm3
Explanation
The balanced chemical equation is 2CO + O2 → 2CO2, which indicates that 2 volumes of CO react with 1 volume of O2. Therefore, if you have 200dm3 of CO, it will require half that volume of O2, which is 100dm3. The other options (50dm3, 60dm3, and 70dm3) result from incorrect applications of the stoichiometric coefficients from the balanced equation.
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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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