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Chemical Calculations and Energy Balances

This resource covers various chemical calculations and energy balance concepts, including density, pressure, enthalpy, conversions, atomic balances, and more. It provides step-by-step solutions and explanations for practice problems.

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Chemical Calculations and Energy Balances

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  1. CHE 205

  2. Chapters 2&3 Chapter 4 Chapters 5&6 Chapters 7&8 Chapter 9 $200 $200 $200 $200 $200 $400 $400 $400 $400 $400 $600 $600 $600 $600 $600 $800 $800 $800 $800 $800 $1000 $1000 $1000 $1000 $1000

  3. What is the density of liquid naphthalene in lbm/ft3?

  4. What is the gauge pressure at the bottom of the tank of water? Po = 1.2 atm h = 15 ft Pg = ?

  5. What is the absolute pressure at the bottom of the tank of water? Po = 1.9 atm h = 30 ft Pa = ?

  6. What is the specific enthalpy of superheated steam at 510 °C and 5.0 bar?

  7. What are the slope and intercept for a semi-log plot of x vs. R using the following data? x 0.23 0.78 R 16.2 3.5

  8. Given the following flow sheet, what is the single-pass fractional conversion? 60 mol A 130 mol A 50 mol B Reactor Separator 120 mol A A B

  9. Given the following flow sheet, what is the selectivity of B relative to C 20 moles A x moles B 30 moles C 150 moles A Reactor A 2B (desired) A C (undesired)

  10. How much air is needed if 50 kg of n-octane are combusted with 75% excess oxygen?

  11. Write all of the extent of reaction balances for the following flow sheet 100 moles reactor x1 mol C3H6/mol (1-x1) mol air/mol n1 mol C3H6 n2 mol O2 n3 mol N2 n4 mol CO2 n5 mol H2O 2C3H6 + 9O2 6CO2 + 6H2O

  12. Given the following flow sheet, write out all of the atomic balances and solve (reaction goes to completion) 100 mol/h Reactor 0.25 mol CH3OH/mol 0.30 mol CH3COOH/mol 0.45 mol H2O/mol n1 mol/h CH3COOH n2 mol/h CH3COOCH3 n3 mol/h H2O CH3OH + CH3COOH CH3COOCH3 + H2O

  13. What is the partial pressure of NH3 in an ideal gas mixture of 25 v/v% NH3 and 75 mol% N2 at 10 bar and 100°C in a 50 m3 tank?

  14. What is the actual volumetric flow rate of an ideal gas at 60 °F, 2 atm, and 300 SCFH?

  15. What is the volumetric flow rate of an 3:1 mole ratio of n-hexane and n-heptane at 100 mol/h at 60°C and 1 atm?

  16. What is the liquid mole fraction of water at 84 °C if the partial pressure of water vapor is 200 mm Hg?

  17. Use Antoine’s equation to estimate the percent saturation of a mixture with xcyclohexane = 0.35 at 25°C if the total pressure is 850 mm Hg

  18. Draw a process path for cyclopentane going from -100 °C and 1 atm to 100 °C and 1 atm. List where you would find any necessary information to calculate ΔĤ’s.

  19. DAILY DOUBLE

  20. Write and simplify the overall energy balance terms for this closed system. Explain if the remaining terms are positive or negative m1 H2O(v) P = 40 bar, sat’d Isothermal Condenser 10 kg H2O(v) P = 5 bar T = 250 °C m2 H2O(l)

  21. Using the psychrometric chart, find the relative humidity, absolute humidity, specific volume and enthalpy of an air stream at 32 °C with a wet bulb temperature of 17 °C

  22. Solve for the unknown mass flow rates in the following flowchart. m1 H2O(v) P = 40 bar, sat’d Isothermal Condenser 10 kg/h H2O(v) P = 5 bar T = 250 °C m2 H2O(l) Q = -4.25 kW

  23. Calculate the heat required to for the process below. 30 kg/h acetone (v) 30 kg/h acetone (l) Heat Exchanger P = 1 atm T = 25 °C P = 1 atm T = 75 °C Q (kW)

  24. Is the heat of reaction for an endothermic reaction positive or negative, and why?

  25. How would you calculate the enthalpy term in a reactive system energy balance using heats of formation? Be sure to list what the reference states would be.

  26. How would you calculate the enthalpy term in a reactive system energy balance using a heat of reaction? Be sure to list what the reference states would be.

  27. DAILY DOUBLE

  28. Calculate the ΔĤr° for the following reaction: CH3OH(g) HCHO(g) + H2(g)

  29. Calculate ΔÛr° for the following reaction: C8H18(g) + 25/2 O2 8CO2(g) + 9H2O(g)

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