QJEEM07Ch619e: JEE Main 2007 Chemistry - Class 11 JEEM07Ch619e Solution: Equal masses of methane and oxygen are mixed in an empty…

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Equal masses of methane and oxygen are mixed in an empty container at 25^oC. The fraction of the total pressure exerted by oxygen is

Accepted Answer

Let the mass of methane and oxygen

= m

g m .

Mole fraction of

O_{2}

= \frac{M o l e s o f O_{2}}{M o l e s o f O_{2} + M o l e s o f C H_{4}}

= \frac{m / 32}{m / 32 + m / 16}

= \frac{m / 32}{3 m / 32} = \frac{1}{3}

Partial pressure of

O_{2}

=

Total pressure

\times

mole fraction of

O_{2},

P_{O_{2}} = P \times \frac{1}{3} = \frac{1}{3} P

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