The following thermochemical equation is for the reaction of ammonium chloride(s) to form ammonia(g) and hydrogen chloride(g).

NH4Cl(s) NH3(g) + HCl(g) H = 176 kJ
How many grams of NH4Cl(s) would be made to react if 53.3 kJ of energy were provided?

dynamic equilibrium is the answer.

a is the correct 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.