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Unformatted text preview: he mass of the gas, but you don’t know the number of moles.
You can’t count them.
Not only are the gas molecules too small to see, they are moving at speeds of several hundred meters per second (~1000 mph) and bouncing off other molecules and changing direction. 9 Avogadro’s hypothesis 10 Using n = PV/RT to determine n • Equal volumes of gases at equal temperatures and pressures hold the same number of particles. – Calculate using the ideal gas law • The pressure in the tube is the same as the pressure in the room.
– Each student should learn to use the mercury barometer that is in the back of the balance area. PV=nRT
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- Fall '06