Chapter 5 Question 10 (of 15) 10. 66 poimts 1 out of 3 attempts Assis Che Vie Be

Question

Chapter 5 Question 10 (of 15) 10. 66 poimts 1 out of 3 attempts Assis Che Vie Be sure to answer all parts. An environmental chemist sampling industrial exhaust gases from a coal-burning plant collects a co2-so2-H20 mixture in a 21.0-L steel tank until the pressure reaches 928.7 torr at 48.0°C. Guie Print Ques Repo (a) How many moles of gas are collected? mol gas (b) f the SO, concentration in the mixture is 8.50 x 103 parts per million by volume (ppmv), what is its partial pressure? Hint: ppmv - (volume of componentvolume of mixture) x 10°J torr

Explanation / Answer

Part a

Volume V = 21.0 L

Pressure P = 928.7 Torr x 1 atm/ 760 Torr = 1.22 atm

Temperature T = 48.0 + 273 = 321.0 K

From the ideal gas equation

Moles of gas = PV/RT

= (1.22 atm x 21.0 L) / (0.0821 L-atm/mol-K x 321.0 K)

= 0.972 moles

Part b

Concentration of SO2 = 8.50 x 10^3 ppmv

Volume of SO2 = ppmv x volume of mixture x 10^-6

Partial pressure of SO2 = ppmv x 10^-6 x total pressure

= 8.50 x 10^3 x 10^-6 x 928.7 torr

= 7.894 torr

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