The gas-phase reaction is to be carried out isothermally first in a flow reactor. the molar feed is 50% h2 and 50% n2, at a pressure of 16.4 atm and at a temperature of 227°c.
(b) express the concentrations in mol/dm3 of each for the reacting species as a function of conversion. evaluate ca0, and then calculate the concentrations of ammonia and hydrogen when the conversion of h2 is 60%.

Apipe with an outside diameter of 15 cm is exposed to an ambient air and surrounding temperature of -20°c. the pipe has an outer surface temperature of 65°c and an emissivity of 0.85. if the rate of heat loss from the pipe surface is 0.95 kw per meter of length, the external convective heat transfer coefficient (h) is: (a) 12.5 w/m"k (b) 18.6 w/mk (c) 23.7 w/mk (d) 27.9 w/mk (e) 33.5 w/mk