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【Daily Question】2018.6.24

2018-06-24View Original

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Fill-in-the-blank: In a 40 mL mixture of CO, CH4, and N2, an excess of air is added. After combustion, the volume decreases by 42 mL, and 36 mL of CO2 is produced. What is the volume fraction of CH4 in the gas? 40%

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