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What is the pressure in the container?36 g of a compound is placed into an evacuated...

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dhopkins895 | Student | (Level 1) Honors

Posted November 28, 2010 at 1:40 AM via web

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What is the pressure in the container?

36 g of a compound is placed into an evacuated 3.00 liter container. When it is heated to 80 degree Celsius, it turns into gas. (Molecular weight of the compound is 72)


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justaguide | College Teacher | (Level 2) Distinguished Educator

Posted November 28, 2010 at 1:42 AM (Answer #1)

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We use the ideal gas law here. PV = nRT, where P is pressure, V is volume, n is number of moles, R is the gas constant, and T is temperature. When the compound is converted to a gas, and we assume the gas to show properties of an ideal gas it exerts a pressure according to the ideal gas law.

Now we are given
V = 3.00 liters
n = 36 / 72 = 0.5 mol
R = 0.0821 l*atm / (mol*K)
T = 273 + 80 = 353 K

Using the values given to us in the Ideal Gas Law:

P = nRT/V

=> P = 0.5 mol x 0.0821 l*atm/ (mol*K) x 353 K / 3.00 liter

P = 4.830 atm

The pressure created due to the compound converting to a gas at 80 degree Celsius is 4.830 atm.

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