What is the enthalpy change when 49.4ml of 0.430M sulfuric acid reacts with 23.3ml of 0.309M potassium hydroxide? H2SO4(aq)+2KOH(aq)+2H2O(l)
Delta H= -111.6 kj/mol

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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.