If the rate of formation of C is 0.526 M/s, what is the rate of disappearance of B for the following reaction A + 3B → 2C?

Question

0.088 M/s

None of the above

0.274 M/s

0.589 M/s

0.789 M/s

Answer 1

A + 3B ==> 2C

-∆[A]/∆t = -1/3∆[B]/∆t = +1/2∆[C]/∆t

relating B to C, we have...

-1/3 B = +1/2 C

-1/3B = 1/2 x 0.526

-1/3B = 0.263

-B = 0.789

So rate of disappearance of B would 0.789 M/s. We can eliminate the negative sign in front of this value since we are stating that it is the rate of DISAPPEARANCE of B (negative sign implied).