Equal moles of hydrogen and oxygen gases are placed in a container with a pin-hole through which...

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Equal moles of hydrogen and oxygen gases are placed in a container with a pin-hole through which both can escape. What fraction of the oxygen escapes in the time required for one-half of the hydrogen to escape?
(a) \( 3 / 8 \)
(b) \( 1 / 2 \)
(c) \( 1 / 8 \)
(d) \( 1 / 4 \)
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