Afuel oil is analyzed and found to contain 86.14 wt% carbon, 11.12% elemental hydrogen (h), 1.90% sulfur, and the remainder noncombustible matter. the oil is burned with 7.5% excess air, based on complete combustion of the carbon to co2, the hydrogen to h2o, and the sulfur to so2. the oil is burned completely, but 6.50% of the carbon forms co. calculate the molar composition of the stack gas. you may take the composition of air to be 79.0 mole% n2 and 21.0 mole% o2.

yes the answer is total mass in unchanged   : )

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.