Basic Chemical Engineering Practice Test 4

1. A reactor is supplied with 5 moles each of CH₃OH and O₂, and the following reactions occur, CH₃OH + 1/2O₂ -> CH₂O + H₂O and then CH₂O + 1/2O₂ -> CO + H₂O, the conversion of methanol is 80% in first reaction, and conversion of CH₂O is 50% in second reaction. How many moles of O₂ are there in the products?

1.75

3.25

5.5

2. Methane is at the rate 50 moles is supplied to a reactor with air at the rate 1000 moles, the reactor leaves O₂, N₂, CO₂ and H₂O, what is the rate of products?

1000 moles

950 moles

1050 moles

900 moles

3. A reactor is supplied with C₆H₁₂O₆ and the following reactions occur C₆H₁₂O₆ -> 2C₂H₅OH + 2CO₂ and C₆H₁₂O₆ –> 2C₂H₃CO₂H + 2H₂O, 360 grams of pure glucose is supplied and 44 grams of CO₂ was produced, what 90 grams of glucose left unreacted, how many grams of ethanol was produced?

186

4. A reactor is supplied with 2 streams both at same rates, one has pure Cl₂, and another has pure C₂H₆, if the product has 20% C₂H₅Cl and 80% HCl, what is the ratio of rate of feed and rate of product?

0.2

0.5

5. Propane is burnt with 20% excess O₂, what is the percentage of CO₂ in products?

45%

25%

75.5%

12.5%

6. A reactor is supplied with two steams with equal flow rates, stream-1 containing 75% SO₂, 25% N₂ and stream-2 containing pure H₂S, if the product has 1200 grams of S, and the ratio of H₂S to H₂O is 5 and the ratio of SO₂ to H₂S is 2, what fraction of excess reagent is converted into product?

0.87

0.74

0.23

0.55

7. A reactor is supplied with two steams with equal flow rates, stream-1 containing 75% SO₂, 25% N₂ and stream-2 containing pure H₂S, if the product has 1200 grams of S, and the ratio of H2S to H₂O is 5 and the ratio of SO₂ to H₂S is 2, what fraction of limiting reagent is converted into product?

0.21

0.46

0.83

0.73

8. A reactor is supplied with a feed of composition 46% C₃H₇O₄, 44% O₂ and 10% N₂, if 50% of the limiting reagent is converted into product, what is the percentage of C₃H₇O₄ in the product?

9. A reactor is supplied with 5 moles each of CH₃OH and O₂, and the following reactions occur, CH₃OH + 1/2O₂ -> CH₂O + H₂O and then CH₂O + 1/2O₂ -> CO + H₂O, the conversion of methanol is 80% in first reaction, and conversion of CH₂O is 50% in second reaction. How many moles of CO are produced?

10. The extent of a reaction is 10, and the stoichiometric coefficient of O₂ is 2.5, if the moles of O₂ entering the process is 45, what is the percentage of excess air?

60%

20%

40%

80%