A stack (T=750 F and P = 800 mm Hg) was sampled using EPA Method 5. The total gas volume that flowed through the gas meter was 4580 liters (at T = 70 F and P = 760 mm Hg):. The mass of particles collected was 4.5 g. Calculate the flow rate, and approximate concentration of PM in the stack (ug/m) at stack conditions. 9.945 cubic meters, 4.5(10)5 ug/m3 O 1.945 cubic meters, 0.5(10)5 ug/m3 9.945 cubic meters, 20.5(10)5 ug/m3 O 3.845 cubic meters, 4.5(10)5 ug/m3