A \( 40 \mathrm{ml} \) of a mixture of \( \mathrm{H}_{2} \) and \( ...

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A \( 40 \mathrm{ml} \) of a mixture of \( \mathrm{H}_{2} \) and \( \mathrm{O}_{2} \) at \( 18^{\circ} \mathrm{C} \) and latm pressure was sparked so that the formation of water was complete. The remaining pure gas had a volume of \( 10 \mathrm{ml} \) at \( 18^{\circ} \mathrm{C} \) and \( 1 \mathrm{~atm} \) pressure. If the remaining gas was \( \mathrm{H}_{2} \), the mole fraction of \( \mathrm{H}_{2} \) in the \( 40 \mathrm{ml} \) mixture is :
A. \( 0.75 \)
B. \( 0.5 \)
C. \( 0.65 \)
D. \( 0.85 \)
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