A student is asked to balance an equation by using the half-reaction method. He determines the two half reactions as shown below.

2 upper B r superscript minus right arrow upper B r subscript 2 plus 2 e superscript minus. Second line: upper C l subscript 2 plus 2 e superscript minus right arrow 2 upper C l superscript minus.

the answer is 75.0%.

c) should be the answer.

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.