Calculate the ground-level downwind center-line concentration of SO2 10 km from the source. The effective stack height is 90 m, the wind speed at stack is 5 m/s, and the emission rate is 0.25 kg/s. The atmosphere has neutral stability. Note: Necessary tables, figures, and equations can be found in 'Air Resources' lecture slides
a. 190 mg/m^3
b. 175 pg/m^3
c. 120 mg/m^3
d. 200 ug/m^3

For the closed feedwater heater below, feedwater enters state 3 at a pressure of 2000 psia and temperature of 420 °f at a rate of ix10 ibhr. the feedwat extracted steam enters state 1 at a pressure of 1000 psia and enthalpy of 1500 btu/lbm. the extracted er leaves at an enthalpy of 528.7 btu/lbm steam leaves as a saturated liquid. (16) a) determine the mass flow rate of the extraction steam used to heat the feedwater (10) b) determine the terminal temperature difference of the closed feedwater heater