Equal weights of methane and oxygen are mixed in an empty container at \( 25^{\circ} \mathrm{C} ...

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Equal weights of methane and oxygen are mixed in an empty container at \( 25^{\circ} \mathrm{C} \). The fraction of the total pressure exerted by oxygen is
(A) \( \frac{1}{3} \)
(B) \( \frac{1}{2} \)
(C.) \( \frac{2}{3} \)
(D) \( \frac{1}{3} \times \frac{273}{298} \)
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