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Rate of Appearance

APCHEM-NNNEIY

For a generic reaction:

$$2 A \rightarrow B$$

...the rate of appearance of $B$ is recorded as $3.5 \times 10^{-2} \text{ M/s}$.

Which of the following is the rate of disappearance of $A$?

A

$- 7.0 \times 10^{-2} \text{ M/s}$

B

$- 3.5 \times 10^{-2} \text{ M/s}$

C

$3.5 \times 10^{-2} \text{ M/s}$

D

$ 7.0 \times 10^{-2} \text{ M/s}$