For the reaction, \( \mathrm{N_2O_5(g) \rightarrow 2NO_2(g) + \frac{1}{2}O_2(g)} \), the value of the rate of disappearance of \( \mathrm{N_2O_5} \) is given as \( 5.15 \times 10^{-3} \, \mathrm{mol\,L^{-1}\,s^{-1}} \). The rate of formation of \( \mathrm{NO_2} \) is