A gaseous sample of pure methane, CH4, is found to occupy a volume of 20.0 L at 25℃ and 1 atm pressure. What volume of O2, at the same temperature and pressure, should be just sufficient to permit complete combustion of the methane?
10.0 L
20.0 L
30.0 L
40.0 L
None of the above is correct.
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