Some Basic Concepts of Chemistry - Result Question 11
####11. What volume of oxygen gas $(O_2)$ measured at $0^{\circ} C$ and $1 atm$, is needed to burn completely $1 L$ of propane gas $(C_3 H_8)$ measured under the same conditions?
[2008]
(a) $7 L$
(b) $6 L$
(c) $5 L$
(d) $10 L$
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Solution:
- (c) Writing the equation of combustion of propane $(C_3 H_8)$, we get
$ \underset{\substack{\text{ lvol } \\ \text{ IL }}}{C_3 H_8}+\underset{5 vol}{5 O_2} \to 3 CO_2+4 H_2 O $
From the above equation we find that we need $5 L$ of oxygen at N.T.P. 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.
