Question

For the hypothetical reaction, \[\ce{2A -> 3C}\], the reaction rate r is given by ______.

Options

• `r = -(d[A])/(dt)`

• `r = -1/2 (d[A])/(dt)`

• `r = -1/3 (d[A])/(dt)`

• `r = (d[A])/(dt)`

Answer 1

For the hypothetical reaction, \[\ce{2A -> 3C}\], the reaction rate r is given by `bbunderline(r = -1/2 (d[A])/(dt))`.

Explanation:

The given reaction is \[\ce{2A -> 3C}\]

for a reaction \[\ce{aA -> bB}\]

The rate is expressed as 

r = `-1/a (d[A])/(dt) = 1/b (d[B])/(dt)`

Here, a = 2 for reactant A.

So,

`r = -1/2 (d[A])/(dt)`