A shell and tube heat exchanger is has 1 shell with 2 tube passes. A 30% methanol solution is flowing through the shell at a rate of 90 kg/s. The shell has a diameter of 12 in. The tubes are ¾-in on a 1-in triangular pitch. The heat exchanger is 2-m long and there are 3 baffles per meter of length. Determine the

a. The tube clearance (mm)

b. The number of tubes in the heat exchanger

c. The Reynolds number of the methanol solution flowing through the shell