The reaction 2 X B is a zeroth order reaction. If the initial concentration of X is 0.2 M , the half-life is 6 ~h . When the initial concentration of X is 0.5 M , the time required to reach its final concentration of 0.2 M will be

Step-by-step solution

For the reaction 2 X B , follow zeroth order Rate equation is Kt =[ A ]₀-[ A ] For the half-life; t=t_ 1 / 2 and [A]=0.1 Kt ₁₂=0.2-0.1 0.2-0.1 6 = 0.1 6 Mhr ⁻¹ Time required to reach from 0.5 M to 0.2 M Kt =[ A ]₀-[ A ] 0.1 6 t =(0.5-0.2) ; t =18 hour