How should this combustion reaction be balanced? C5Hg + 02 → C02 + H2O

A. C5Hg + 502 → 5C02 + H2O

B. C5H9 +3.502 → 5CO2 + 8H20

C. C5Hg + 702 → 5CO2 + 4H20

D. C5Hg + 302 → CO2 + 4H20

Answer is C. C5H8 + 7O2 -> 5CO2 + 4H2O

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.