What volume of oxygen gas (O2) measured at 0°C and 1 atm, is needed to burn completely 1 L of propane gas (C3H8) measured under the same conditions?
(a) 5 L
(b) 10 L
(c) 7 L
(d) 6 L
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Ans. (a) 5L
C3H8 + O2 ⇒ CO2 + H2O
balancing eqn - C3H8 + 5O2 ⇒ 3CO2 + 4H2O
1 mole C3H8 -> 5 mole O2
22.4 L C3H8 -> 5 x 22.4 L = 112 L O2
1 L C3H8 -> 112/22.4 = 5 L O2
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