The concentration-time graph for the first-order decomposition of reactant W\text{W}W is shown below.
What is the half-life of this reaction when the concentration of W\text{W}W is 0.60 mol dm-3?
15 s15\text{ s}15 s
30 s30\text{ s}30 s
42 s42\text{ s}42 s
60 s60\text{ s}60 s
