Which symbol equation correctly describes the reaction: Wood (mostly glucose) burns in the presence of oxygen to form water and carbon dioxide?

A. C6H12O6+O2→H2O+CO2
B. O2→H2O+CO2+C6H12O6
C. C6H12O6→O2+H2O+CO2
D. O2+H2O→CO2+C6H12O6

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.