The equilibria of a gaseous mixture of nitrogen dioxide and nitrogen tetroxide is studied by measuring the velocity of a sound wave propagated through the gas. The degree of dissociation α and the equilibrium constant Kp are determined as functions of temperature from 0 to 50°C, and pressure from 0 to 1 atm. At 30°C, Kp is found to be 0.214 atm. The heat of reaction ΔH is determined to be 14.59 kcal mol−1 for the second-law value, and 13.65 kcal mol−1 for the third-law value.
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Harvey Blend (1970) studied this question.
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