Hydrogen peroxide, H2O2, can be prepared with the following successive reactions: 2NH4HSO4 → H2 + (NH4) 2S2O8
(NH4) 2S2O8 + 2H2O → 2NH4HSO4 + H2O2
The first reaction is electrolytic; the second involves steam stripping. What current would be used in the first reaction to produce the (NH4) 2S2O8 needed to obtain 100 g of pure H2O2 with the second reaction? Assume that the anodic efficiency of the current is 50%.

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.

its b it was a compound