A charge of 4.0 microC is placed at each corner of a square 0.10 m on a side. (a) Draw the force vector on the upper right charge.
(b) Determine the magnitude and direction of the force.

The first-order reaction a→2b+c has rate constant 0.538 s−1. if the initial concentration of a is 0.867 mol l−1, what is the half-life of the reaction in seconds? remember to use correct significant figures in your answer (round your answer to the nearest hundredth). do not include units in your response.