What fraction of total pressure is contributed by oxygen when equal masses of oxygen and methane mix in a vessel at 25°C ?
Show answer Hide answer
Answer: B. 1/3
Explanation
Equal masses of oxygen and methane yield mole fractions of one third and two thirds. Dalton law states that partial pressure is proportional to the mole fraction of each gas. Oxygen contributes one third of the total mixture pressure based on its calculated mole fraction. Molar mass of oxygen molecule is thirty two grams per mole while methane is sixteen. Calculating moles involves dividing equal mass values by respective molecular weights. Total pressure of an ideal gas mixture equals the sum of all individual partial pressures.
Chemical plant engineers calculate partial pressures to determine reactant concentrations in reactors. Combustion analysis of fuel gas mixtures requires accurate mole fraction and pressure evaluations. Safety systems monitor partial pressures of oxygen to prevent flammable gas mixture explosions. Two thirds represents the mole fraction and pressure contribution of the methane component. One half assumes equal molar amounts rather than equal mass quantities in the vessel. Temperature ratio multipliers incorrectly apply thermal correction factors to simple mole fractions.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
Related questions
Q1. The translational kinetic energy possessed by ideal gas molecules is proportional to (where T = absolute temperature of the gas)__________________?
Show answer Hide answer
Answer: A. T
Translational kinetic energy of ideal gas molecules is directly proportional to absolute temperature. Kinetic theory of gases establishes that thermal energy scales linearly with Kelvin temperature. Doubling the absolute...
Q2. What are the dimensional units used for mass velocity___________________?
Show answer Hide answer
Answer: B. kg/m2.hr
Mass velocity is defined physically as the mass flow rate passing through a unit cross-sectional area per unit time. Dividing the mass flow rate in kilograms per hour by the cross-sectional area yields units of kilograms...
Q3. How is the water flow in a river during flood conditions classified in fluid mechanics_________________ flow?
Show answer Hide answer
Answer: B. Unsteady non-uniform
Flood conditions in a river vary with time making the fluid flow unsteady. Channel cross section geometry and flow velocities vary along the river making it non uniform. Combining time variation and spatial variation cla...
Q4. How many degrees of freedom characterize a binary, non-reacting miscible system forming an azeotrope in vapor-liquid equilibrium?
Show answer Hide answer
Answer: C. 1
Binary azeotropic mixture in vapor liquid equilibrium behaves like a single component system. Gibbs phase rule states degrees of freedom equal components minus phases plus two. Subtracting two phases and one component fr...
Q5. A binary miscible non-reacting system exhibiting vapor-liquid equilibrium and forming an azeotrope possesses how many degrees of freedom?
Show answer Hide answer
Answer: C. 2
A binary non-reacting system forming an azeotrope possesses two degrees of freedom when operating under variable conditions. Applying the Gibbs phase rule to a two-component system with two equilibrium phases yields two...
Q6. What physical phenomena occur during a reversible adiabatic expansion process?
Show answer Hide answer
Answer: B. Cooling takes place
Reversible adiabatic expansion causes a gas to perform external work using internal energy. Expending internal energy without heat addition results in a direct drop in gas temperature. Cooling is an inherent thermodynami...