Hlp plz.

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.

Ascientist wants to test ways to reduce pollution in lake . what is the bestway of doing this

What is the largest meteoroid that has collided with this planet