The decomposition of benzene diazonium chloride in aqueous solution is a reaction of first order which proceeds as C₆H₅N₂Cl → C₆H₅Cl + N₂ (g) . A certain solution of benzene diazonium chloride contains initially an amount of this compound which gives 80 cm³ of nitrogen on complete decomposition. It is found that at 30⁰C, 40cm³ of nitrogen are evolved in 40 minutes. How long (in min) after the start of the decomposition, will 70cm³ of nitrogen have been evolved (log 2 = 0.3010)