The hydrocarbon octane burns to give CO2 and water vapor. 2 C3H18(9) + 25 02(g) → 16 CO2(g) + 18 H20(g) If a 0.084 g sample of octane burns completely in 02, what will be the pressure of water vapor in a 4.75 L flask at 30.0°C? atm If the 0, gas needed for complete combustion was contained in a 4.75 L flask at 26.0°C, what would its pressure be? atm

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