(c) A 0.5kg/s flow of methane is being dumped through a pipe into the atmosphere. With reference to the flammability diagram in Figure Q4 below, calculate how much nitrogen must be mixed with the pipe flow to avoid a flammable mixture in the open. Express your answer as both \% volume and mass flow rate of Nitrogen. Briefly explain the mechanism through which nitrogen influences the mixture flammability. [7 marks] Joses)