Calculate the standard enthalpy of the reaction, δh∘rxn, for the thermite reaction: 2al(s) fe2o3(s)→2fe(s) al2o3(s) elements in their standard state have an enthalpy of formation value of zero. the standard enthalpies of formation of fe2o3 and al2o3 are δh∘f of fe2o3(s)

b) nuclear ive learned that in a pedtrodic table

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.