3y you colleet a certain gas in a eudiometer (gas tube) so the level of water on

Question

3y you colleet a certain gas in a eudiometer (gas tube) so the level of water on the inside of the eudiom is the same as the water level on the outside. What is the pressure of the dry gas? Barometric pressure 740mm of Hg; temperature of the water 20°C Barometric pressure wet pressure of gas in tube therefore: 740mm of Hg (wet pressure) 17.5mm of Hg (water vapor) 722.5 mm of Hg 4) In a lab experiment, concentrated HCI reacted with Aluminum. The hydrogen gas was collected over water at 26°C. It had a volume of 250ml and a total pressure of 110.8 kiloPascals. How many grams of hydrogen did we What is the partial pressure of the hydrogen gas? collect (use Ideal gas law)?

Explanation / Answer

total pressur = 110.8kilopascals

                      = 110.8*7.5 mmHg                   [ 1kilopascal = 7.5 mmHg]

                       = 831mmHg

water vapor pressure at 260C    = 25.2mmHg

total pressure   = partial pressure of H2 + water vapor pressure

831                  = PH2 + 25.2

PH2                 = 831-25.2   = 805.8mmHg

PH2                 = 805.8/760 = 1.06atm

V   = 250ml = 0.25L

T = 26+273 = 299K

M = 2g/mole

PV = nRT

n = W/M

PV = WRT/M

W    = PVM/RT

         = 1.06*0.25*2/0.0821*299    = 0.0216g

      =

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