How Much How Fast & How Far E.2 Rate of Chemical Change (id: 1d14f0f98)

本题目来源于试卷: How Much How Fast & How Far E.2 Rate of Chemical Change，类别为 IB化学

[单选题]
A reaction involvingguug. pg3e3: x ddb*6xpre4g3 l1tjf.3 ejjo/$X$ and $Y$ is measured and the following data is found:

Trial	$[X]$$(mol dm^{-3})$	$[Y]$$(mol dm^{-3})$	$Rate$$(s^{-1})$
1	0.10	0.50	0.20
2	0.20	0.50	0.40
3	0.20	0.25	0.40

What possible mechanism is consistent with the data?

A. $X$+$X$→$I$(slow) $I$+$Y$→​$Z$ (fast)
B. $X$+$Y$→$I$(fast) $I$→​$Z$ (slow)
C. $X$→$I$(slow) $I$+$Y$→​$Z$ (fast)
D. $X$→$I$(fast) $I$+$Y$→​$Z$ (slow)


参考答案:  C


本题详细解析:
C

Using trials 1 and 2, as $[X]$ doubles, rate also doubles therefore first order with respect to $[X]$.
Using trials 2 and 3, as $[Y]$ halves, rate stays the same and so, zero order with respect to $[Y]$.
This gives a slow step that depends on unimolecular $X$, and not $Y$.

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