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Stoichiometry - Engineering

Q1:

"The equilibrium value of the mole fraction of the gas dissolved in a liquid is directly proportional to the partial pressure of that gas above the liquid surface". This statement pertaining to the solubility of gases in liquid is the __________ law.

A Raoult's

B Henry's

C Amgat's

D none of these

ANS:B - Henry's

The statement "The equilibrium value of the mole fraction of the gas dissolved in a liquid is directly proportional to the partial pressure of that gas above the liquid surface" pertains to Henry's Law. Henry's Law describes the behavior of ideal dilute solutions and states that at a constant temperature, the concentration of a gas dissolved in a liquid is directly proportional to the partial pressure of that gas above the liquid. In mathematical terms, it can be expressed as: 𝐶=𝑘⋅𝑃C=k⋅P Where:

  • 𝐶C is the concentration of the gas in the liquid (usually in mol/L),
  • 𝑘k is Henry's law constant (specific to each gas-solvent combination and usually has units of M/atm or mol/(L·atm)),
  • 𝑃P is the partial pressure of the gas above the liquid (usually in atm).
Henry's Law is widely used in various fields such as chemistry, environmental science, and engineering, particularly in the study of gas solubility in liquids and the design of gas-liquid separation processes.