How Much How Fast & How Far E.2 Rate of Chemical Change (id: 82ba9b272)

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]

In the following reaction, the initial rate of appearance of$CO_2$is measured to be$3.0\times 10^{-2}mol$ $dm^{-3}$ s$^{-1}$ , what is the rate of disappearance of $O_2$​?

$C_2H_6O$(l)+$3O_2(g)$→$2CO_2(g)$+$3H_2O$(g)

A. $4.5\times 10^{-2}mol$ $dm^{-3}$ s$^{-1}$
B. $3.0\times 10^{-2}mol$ $dm^{-3}$ s$^{-1}$
C. $6.0\times 10^{-2}mol$ $dm^{-3}$ s$^{-1}$
D. $1.5\times 10^{-2}mol$ $dm^{-3}$ s$^{-1}$


参考答案:  A


本题详细解析:

A

The overall rate of the reaction is ${\displaystyle \frac{3.0\times 10^{-2}����{�}^{-3}{�}^{-1}}{2}}=1.5\times 10^{-2}����{�}^{-3}{�}^{-1}$.

O${}_2$ disappears 3 times the overall, or $1.5\times 10^{-2}����{�}^{-3}{�}^{-1}\times 3=4.5\times 10^{-2}����{�}^{-3}{�}^{-1}\mathrm{.}$

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