For the equilibrium A(g) + B(g) ⇌ AB(g), what is the equilibrium constant ‘K’ when the partial pressures of A, B, and AB are 10-2 atm, 10-3 atm, and 1 atm, respectively____________________?
Show answer Hide answer
Answer: B. 105 atm-1
Explanation
The equilibrium constant equals product partial pressure divided by reactant partial pressures multiplied. Substituting the given values gives one divided by ten to the minus two times ten to the minus three. Evaluating the arithmetic yields ten to the fifth power with inverse atmosphere units. Equilibrium constants quantify the ratio of product concentrations to reactant concentrations at equilibrium. Partial pressures are expressed in atmospheres for gas-phase equilibrium constant calculations. Units for equilibrium constants depend on the stoichiometric mole changes of the balanced reaction.
Industrial ammonia synthesis reactors use equilibrium calculations to maximize product yields. Chemo-informatics software automatically computes gas-phase equilibrium constants for complex chemical mixtures. Understanding partial pressure ratios helps chemical engineers control reactor feed gas compositions. Ten with inverse atmosphere units results from incorrect exponent arithmetic during substitution. Ten dimensionless is wrong because the reaction involves a net decrease in moles. Ten to the fifth dimensionless ignores the necessary pressure units required for this expression.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
Related questions
Q1. Compressibility factors for nearly all gases are approximately equal at the same__________________?
Show answer Hide answer
Answer: B. Reduced pressure and reduced temperature
The principle of corresponding states states that gases share compressibility factors at reduced conditions. Reduced pressure and temperature normalize real gas properties relative to their critical point values. Gases b...
Q2. A compound possessing a large heat of formation is_____________________?
Show answer Hide answer
Answer: A. More stable
A compound with a large positive heat of formation contains a high amount of stored chemical energy, making it less stable and prone to decomposition.
Q3. Plotting compressibility factor against reduced pressure on reduced coordinates simplifies__________________?
Show answer Hide answer
Answer: A. Use of only one graph for all gases
Generalized reduced coordinates allow a single universal chart to represent diverse gases. Plotting compressibility factors against reduced pressure eliminates the need for separate gas graphs. The principle of correspon...
Q4. The COP of a refrigerator consuming 1 kW of power per ton of refrigeration is roughly____________________?
Show answer Hide answer
Answer: B. 3.5
One ton of refrigeration corresponds to a specific heat removal rate of thermal energy. Consuming one kilowatt of electrical power to achieve this cooling rate yields a ratio of 3.5. Standard commercial refrigeration uni...
Q5. Corona discharge is associated with the functioning of a/an_______________________?
Show answer Hide answer
Answer: B. Electrostatic precipitator
Electrostatic precipitators rely on corona discharge to ionize gas molecules surrounding discharge wires. Ions generated by the corona charge passing dust particles so electrostatic fields attract them. High voltage drop...
Q6. The relation Cp – Cv = R holds true for ______________ gases?
Show answer Hide answer
Answer: A. Ideal
The thermodynamic relation connecting heat capacities strictly applies to ideal gas systems. Ideal gas internal energy depends exclusively on temperature rather than pressure or volume changes. Deriving this equation req...