Cyanomethane CH3CN, commonly known as acetonitrile, is a toxic volatile liquid, used as solvent to purify steroids and to extract fatty acids from fish oils. Acetonitrile can be synthesised from methyl iso-nitrile by the isomerisation reaction: CH3NC (g) CH3CN (g) This reaction obeys the first-order rate law: Rate = k [CH3NC], in the presence of Argon. The activation energy for this reaction is 161 kJ mol1, and the rate constant is 6.6 104 s1 at 500. K. Calculate the time (in seconds) required for the concentration of CH3NC to decrease to 95% of its initial value, at 300. K