[Question of the Week] Participation from Feb 3 to Feb 12, 2017 grants +2 Wealth； Correct answers earn an additional 3–10 wealth points
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To boost the popularity of the Chemical Engineering Analysis section, we are launching the “Question of the Week” activity. This will not only foster a lively atmosphere for technical exchanges, but also reward users with certain amounts of wealth. [Daily Question] Multiple-choice question: In a 40 mL mixture of CO, CH4, and N2 gases, an excess amount of air is added. After combustion, it is found that the volume has decreased by 42 mL, and 36 mL of CO2 has been produced. What is the volume fraction of CH4 in the original gas mixture? A. 10% B. 40% C. 50% D. 90% Standard answer: B Please post your answer as a reply to participate in the quiz; you’ll earn +2 wealth points. Those who answer all questions correctly will receive an additional 3–8 wealth points. Additionally, if you provide a thorough analysis and explanation of the question/answer, along with detailed calculations, you’ll be rewarded with extra wealth points. If your answer is correct and your analysis is accurate, it may be designated as the “Best Reply” or “Best Response”. Feel free to answer the questions.
In a 40 mL mixture of CO, CH4, and N2 gases, an excess amount of air was added. After combustion, it was found that the volume decreased by 42 mL, and 36 mL of CO2 was produced. The volume fraction of CH4 in the gas mixture is (B). A. 10% B. 40% C. 50% D. 90%