Question 21M.2.HL.TZ1.b(iv)

k = $\frac{∆\mathrm{rate}}{∆\left[{\mathrm{N}}_2{\mathrm{O}}_5\right]}$ ✔

«k = $\frac{0.75\times {10}^{-3}«\mathrm{mol} {\mathrm{dm}}^{-3} {\min }^{-1}»}{25\times {10}^{-3}«\mathrm{mol} {\mathrm{dm}}^{-3}»}$= » 0.030 «min^–1» ✔

min^–1 ✔

M1 can be awarded from correct M2 if not explicitly stated.

Accept k = gradient.

Accept values in the range 0.028–0.032.

Award [3] for correct final answer.