QUESTION 2 A tank containing gas mixture of 50 vol % methane, 20 vol nitrogen and 30 vol % oxygen is to be emptied prior to maintenance service. (a) Is it safe enough by just continuously discharging the mixture into atmosphere? Briefly justify your answer by showing the process path on the methane flammability diagram. If applicable, identify the point at which it starts becoming flammable and estimate the corresponding molar composition (mol %) of the mixture