The following experiment is used to determine the amount of helium gas in a cont

Question

The following experiment is used to determine the amount of helium gas in a container.

The volume of the container is 6.80 L, the height of the mercury gap is 466 mm, the ambient temperature is 26C, and the atmospheric pressure is 753 torr.

=

Determine the pressure in the container, the number of moles of gas, and the mass of the gas.

pressure in the container ______ atm number of moles of gas ______ mol mass of the gas ______ g The following experiment is used to determine the amount of helium gas in a container. The volume of the container is 6.80 L, the height of the mercury gap is 466 mm, the ambient temperature is 26½C, and the atmospheric pressure is 753 torr. = Determine the pressure in the container, the number of moles of gas, and the mass of the gas. pressure in the container ______ atm number of moles of gas ______ mol mass of the gas ______ g

Explanation / Answer

from your question we can see

pressure inside container - atmospheric pressure = mercury gap

P - atmosppheric pressure = 466 mmHg

P - 753 torr or mmHg = 466

P = 466 + 753 = 1219 mmHg = 1.604 atm .......answer

use eqn PV = nRT

n = PV/RT = 1.604*6.80/0.08206*(273.15+26) = 0.444 mole .....answer

mass of 1mole of He = 4 gm

then mass of He gas in container = 0.444*4 gm = 1.776 gm .......answer

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