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Question Q142) What volume of oxygen gas (O2) measured at 0°C and 1 atm, is needed to burn completely 1 L of methane gas (CH4) measured under the same conditions?


One mole of gasses occupy equal volume irrespective of there atomic masses
CH4 + 2O2 → CO2 + 2H2O
Or one mole of CH4 requires two moles of oxygen
Thus 1L of CH4 requires 2 L of oxygen

Answer : (b)