Practice question

Given: The Henry's law constant for a gas in water is 4 × __10POW₄__bar at 298 K. What is the mole fraction of the gas under a partial pressure of 2 bar? These values define the system as per NCERT data. Formula: p = K_H · x. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: 2 = 4 × __10POW₄__ · x . x = 2/4 × __10POW₄__= 5 × 10⁻⁵. Result: The computed value matches the expected outcome and confirms the correct choice. Units and powers like J kg⁻¹ K⁻¹, m/s², 10⁻⁵ are properly used as per NCERT.