SATHEE: Some Basic Concepts of Chemistry

Some Basic Concepts of Chemistry - Result Question 11

####11. What volume of oxygen gas $(O_{2})$ measured at $0^{\circ} C$ and $1 a t m$ , is needed to burn completely $1 L$ of propane gas $(C_{3} H_{8})$ measured under the same conditions?

[2008]

(a) $7 L$

(b) $6 L$

(d) $10 L$

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Solution:

$\underset{\begin{matrix} lvol \\ IL \end{matrix}}{C_{3} H_{8}} + \underset{5 v o l}{5 O_{2}} \to 3 C O_{2} + 4 H_{2} O$

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.

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Some Basic Concepts of Chemistry - Result Question 11

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