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What volume of oxygen gas (O2) measured at 0°C and 1 atm, is needed to burn completely 11.2 L of propane gas (C3H8) measured under the same conditions?

1. 7L
2. 6L
3. 5L
4. 10L

Correct answer: 5L

Solution

The balanced chemical equation for the combustion of propane is C3H8 + 5O2 -> 3CO2 + 4H2O. From the equation, 1 mole of propane requires 5 moles of oxygen. Given that 11.2 L of propane is provided, we can calculate the volume of oxygen required using the ideal gas law.

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