Hydrogen was introduced into an evacuated vessel with a volume of 500 cm3 to a pressure of 200 mmHg. Art. at a temperature of 20° C. Oxygen was introduced into another similar vessel to a pressure of 100 mm Hg. Art. Both vessels were connected and after the gases were mixed, an electric spark was passed through; the explosive mixture burned. How much water condensed on the walls of the vessel after the installation assumed its initial temperature? The saturation vapor pressure of water at 20° C is 17.5 mm Hg. Art.

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