申論題

6. Methane (CH₄) is an important greenhouse gas in the atmosphere. Currently, the average concentration of CH, in the atmosphere is 1.75 ppmv, and it will react with the hydroxyI radicals (ㆍOH). The reaction formula is and the reaction rate R = k[CH₄] [ ㆍOH]. Where the reaction rate constant k= . Assuming that the concentration of hydroxyl radicals (ㆍOH) in the atmosphere is 8.5 x 10⁵ molecules, and 1.0 ppm CH₄ = 1.0 mole CH₄/10⁶ mole air.