For the elementary step

CHEMISTRY · Single correct · AP · Chemistry · Kinetics · Kinetics

Problem

For the elementary step 2 A(g)+B(g)→C(g)2\,\mathrm{A}(g)+\mathrm{B}(g)\rightarrow \mathrm{C}(g), which differential expression correctly represents the rate of disappearance of A\mathrm{A}? (a) −d[A]dt=k[A]2[B]-\dfrac{d[\mathrm{A}]}{dt}=k[\mathrm{A}]^{2}[\mathrm{B}] (b) −d[A]dt=2k[A]2[B]-\dfrac{d[\mathrm{A}]}{dt}=2k[\mathrm{A}]^{2}[\mathrm{B}] (c) −d[A]dt=2k[A][B]-\dfrac{d[\mathrm{A}]}{dt}=2k[\mathrm{A}][\mathrm{B}] (d) −d[A]dt=12k[A]2[B]-\dfrac{d[\mathrm{A}]}{dt}=\dfrac{1}{2}k[\mathrm{A}]^{2}[\mathrm{B}]

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