A mixture of two gas flows is used to calibrate an air-pollution measure-ment instrument. The calibration system is shown in Figure 4-21. If the calibration gas concentration Ccal is 4.90 ppmv, the calibration gas flow rate Qcat, is 0.010 L min-1, and the total gas flow rate Qtotal is 1.000 L min-1 what is the concentration of calibration gas after mixing (Cd/s)? (Assume that the concentration upstream of the mixing point is zero.)
