Answer the questions about the following reaction. 2K(s) + Br2(l) 2KBr(s)

How many molecules of Br are used in the reaction?
1,2,or3
How many bromine atoms are used in the reaction?
1,2,3,or4
How many moles of KBr are formed?
1,2,3,or4
What is the mole ratio of Br2 to KBr?
1/2,1/1,or 3/2

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.