Some Basic Concepts Of Chemistry Question 77
Question: What volume of oxygen gas $ (O _2) $ measured at $ 0{}^\circ C $ and 1 atm, is needed to burn completely 1L of propane gas $ (C _3H _8) $ measured under the same conditions?
Options:
A) 7L
B) 6L
C) 5L
D) 10L
Show Answer
Answer:
Correct Answer: C
Solution:
[c] Writing the equation of combustion of propane $ (C _3H _8) $ , we get $ \underset{\begin{smallmatrix} 1,vol \\ 1L \end{smallmatrix}}{\mathop{C _3H _8}},+\underset{\begin{smallmatrix} 5vol \\ 5L \end{smallmatrix}}{\mathop{5O _2}},\to 3CO _2+4H _2O $ From the above equation we find that we need 5 L of oxygen at NTP to completely burn 1 L of propane at N.T.P. If we change the conditions for both the gases from N.T.P. to same conditions of temperature and pressure. The same results are obtained, i.e. 5 L is the correct answer.
