Afuel gas is known to contain methane, ethane, and carbon monoxide. a sample of the gas is charged into an initially evacuated 2 l vessel at 25°c and 2323 mm hg absolute. the vessel is weighed before and after being charged, and the mass difference is found to be 4.929 a. the higher heating value of the gas is determined in a calorimeter to be 963.7 kj molt. 1 atm = 760 mm hg. (a) define the following terms related to fuels: heating value, higher and lower heating values. [3 marks] (b) how can the lower heating value be calculated from the higher heating value? [1 mark] showing all notation, write the formula for calculation of the heating value of a mixture of: (0) (ii) combustible substances; combustible and inert substances. [2 marks] [2 marks] (d) describe briefly the principle of operation of a calorimeter. [3 marks] (e) using data from table q5 below, calculate the molar composition of the gas after the calorimetric analysis. [9 marks] table q5: heats of formation and combustion of compounds in gaseous phase compound formula aħ, kj mol ař, kj mol-1 carbon monoxide co -110.52 -282.99 ethane c2h6 -84.67 -1559.9 methane cha -74.85 -890.36