The CI engine in Figure 6 burns dodecane (C_{12}H_{26}) with the excess air shown. Take atomic masses C = 12, H = 1, O = 16; air contains 23.2 % oxygen by mass; the density of air at the intake is given on the figure. Determine (a) the stoichiometric air–fuel ratio (in kg air/kg fuel), (b) the actual mass flow rate of air (in kg/h), and (c) the volumetric efficiency of the engine (in %).