b) A gas mixture comprises 1.5% methane, 3% ethane, 2.5% propane, and 4% butane by volume. Refer the Table Q4 (b) for flammability data. Table Q4(b): Flammability data of the individual component Calculate: (i) Mole fraction on the combustible basis for each component; (ii) Lower flammability limit; (iii) Upper flammability limit