Under the piston closing a cylindrical vessel having a volume Vo = 10 l and placed in a thermostat at t0 = -57 ° C, there is m = 1.9 g of gaseous ammonia (molecular weight 17). How much ammonia will condense when the gas is compressed by the piston to volume V = Vo/2? The saturated vapor pressure of ammonia at -57° C is 200 mm Hg. Art.
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