Question

A novel gaseous hydrocarbon fuel CxHy is proposed for use in spark-ignition engines. An analysis of a sample of this fuel revealed that its molecular weight is 140 and its molar H/C ratio is 2.0. In order to evaluate some of its properties, the fuel was burned with stoichiometric standard air in a constant pressure, steady-flow reactor. The fuel and air entered the reactor at 25°C, and the products of complete combustion were cooled to 25°C. At the exit condition, water in the products was a liquid. It was measured that the heat given off during the process to the cooling system of the reaction was 47.5 MJ/kg of fuel. a) Determine the fuel formula. b) What does that heat given-off to the cooling system of the reactor represent? c) Determine the lower heating value of the fuel. d) Determine the enthalpy of formation of the fuel at 25°C

Answer 1

(a) Fuel formula = C₁₀H₂₀

(b)The reactor represent higher heating value (HHV) of the fuel because the water in the product is liquid.

(c) Lower heating value = 44.36 mj/kg

(d) - 6669.8 KJ/Kmol

Step-by-step explanation:

See the attached files for the calculation