The barometric pressure is 760.8 torr, a water manometer, connected between the atmosphere and a bulb containing helium has a height difference of 19.1 cm (water level is higher near the bulb) Calculate pressure in the bulb in torr.
This is physics, not chemistry. You don't need to know the chemical composition of the gas in the bulb, except that it's insoluble. Mercury has a density of 13.6 so the pressure in the bulb must be 763.0-(13.6x30.2/1000)=763.0-0.41=762.59 torr.
Oct 3rd, 2014
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