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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

1 Answer

Best answer

Ans. (a) 5L


C3H+ O⇒ CO+ H2

balancing eqn - C3H+ 5O⇒ 3CO+ 4H2


1 mole C3H8  -> 5 mole O

22.4 L C3H8  -> 5 x 22.4 L = 112 L O

1 L C3H -> 112/22.4 = 5 L  O2

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