THE VAPOR DENSITY OF HYDROGEN SULPHIDE

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Abstract
An apparatus for the measurement of the vapor density of condensable gases at pressures greater than atmospheric and at various temperatures is described. The vapor density of redistilled hydrogen sulphide was measured at 47°, 25°, 0°, −20°, and −35 °C., and up to 4 atm. pressure. The interpolated value for the vapor density of hydrogen sulphide under standard conditions was found to be 1.537. This value agrees with the values given by Leduc (1.538) and Baume and Perrot (1.539), but the difference may be attributed in part to the neglect of the earlier experimenters to allow for deviations from the gas laws in correcting their values to standard pressure. The results are expressed as apparent molecular weights, and the deviations from the theoretical value shown to be due to the action of molecular attraction.

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