A solution of \( \mathrm{N}_{2} \mathrm{O}_{5} \) in \( \mathrm{CCl}_{4} \) yields by decomposit...

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A solution of \( \mathrm{N}_{2} \mathrm{O}_{5} \) in \( \mathrm{CCl}_{4} \) yields by decomposition at \( 45^{\circ} \mathrm{C}, 4.8 \mathrm{ml} \) of \( \mathrm{O}_{2}, 20 \) minutes after the \( \operatorname{start} \) of the experiment and \( 9.6 \mathrm{ml} \) of \( \mathrm{O}_{2} \) after a very long time. The decomposition obeys first-order kinetics. What volume of \( \mathrm{O}_{2} \) would have evolved, 40 minutes after the start?
(a) \( 7.2 \mathrm{ml} \)
(b) \( 2.4 \mathrm{ml} \)
(c) \( 9.6 \mathrm{ml} \)
(d) \( 6.0 \mathrm{ml} \)
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