Practice question

Given: The Henry's law constant for a gas in water is 8 × __10POW₃__bar at 298 K. What is the mole fraction of the gas under a partial pressure of 0.4 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: 0.4 = 8 × __10POW₃__ · x . x = 0.4/8 × __10POW₃__= 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.