Oxygen is present in \( 1 \mathrm{~L} \) flask at a pressure of \( 7.6 \times 10^{-10} \mathrm{~...

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Oxygen is present in \( 1 \mathrm{~L} \) flask at a pressure of \( 7.6 \times 10^{-10} \mathrm{~mm} \) \( \mathrm{Hg} \). Calculate the number of oxygen molecules in the flask at \( 0^{\circ} \mathrm{C} \).
(A) \( 2.686 \times 10^{10} \)
(B) \( 26.86 \times 10^{10} \)
(C) \( 0.626 \times 10^{12} \)
(D) \( 4.123 \times 10^{8} \)
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