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A gasoues sample of carbon disulfide (CS2) is mixed with an equal volume of oxyg

ID: 573853 • Letter: A

Question

A gasoues sample of carbon disulfide (CS2) is mixed with an equal volume of oxygen gas at the same temperature and pressure, and the mixture is ignited. After the reaction is complete, the reaction mixture is 120 kPa. What is the partial pressure of SO2 (g) in the final mixture?


gaseous sample of carbon disulfide (CS2) is mixed with an equal volume of oxygen gas at the same temperature and pressure, and the mixture is ignited. The unbalanced equation is: 6. A cs, (g) 02 (g) CO2 (g)+SO2(g) After the reaction is complete, the total pressure of the reaction mixture is 120 kPa. What is the partial pressure of SO2 (g) in the final mixture? A) 24 kPa B) 30 kPa C) 48 kPa D) 60 kPa E) 80 kPa

Explanation / Answer

Balanced equation,

(1/3)CS2 + O2 ---> (1/3)CO2 + (2/3)SO2

Total pressure after the reaction is complete = 120 kPa

reactants used up, products formed

120 kPa = p[CS2] + p[CO2] + p[SO2]

              = (2/3) + (1/3) + (2/3)

              = 1.67

Partial pressure of SO2(g) in the mixture = [(2/3)/1.67] x 120 kPa

                                                                  = 48 kPa

So answer is,

C) 48 kPa

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