As the youngest engineer in the office, you are installing and calibrating a dry

Question

As the youngest engineer in the office, you are installing and calibrating a dry gas sampler on an exhaust stack. The stack gases are at 220^degree C and 710 mm Hg. The rate of flow inside the sampler is measured at 25 liters/minute. Inside the sampler, the sampler gas has been cooled to 25^degree C and the pressure is 770 mm Hg. Calculate the sampler gas flow rate when it is corrected to the actual stack gas conditions (220^degree C and 710 mm Hg). In other words, Solve for Qstack. Estimate the concentration of NOx at the downwind edge of the city. The city may be considered to consist of four parallel strips, located perpendicular to the wind. For all the strips, the upwind velocity "u" equals 3 m/sec. The properties of each of the strips are described in the following table: Assume that the fixed box model applies to each of the strips. The background concentration b in the air entering the upwind suburbs is 1.2 mg/m^3.

Explanation / Answer

(1)

Initial Temperature and pressure of sample gas are 220 C and 710 mm Hg

Volumetric flow rate of the gases is 25 L/min

Assume gases are ideal and calculate the molar flow rate of gas at the entrance.

molar flow rate = PV/RT = (710/760) atm x 25 L/min) / ( 0.082 L atm/mol K) x(493.15 K)

= 0.577 mol/min

Now this molar flow rate will be same.

So, now we will find new volumtric flow rate using following formula:

Q stack = nRT/P

= (0.577 mol/min) x ( 0.082 L atm /K mol ) x (298.15 K ) / (770/760) atm

= 13.94 L/min

Only one answer should be done according to chegg rules

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.