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Calculate the number of moles of oxygen in 2.00L at 24 degrees Celsius and 750 torr.

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bella-80085 | (Level 1) eNoter

Posted May 15, 2013 at 3:43 PM via web

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Calculate the number of moles of oxygen in 2.00L at 24 degrees Celsius and 750 torr.

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mvcdc | Student, Graduate | (Level 1) Associate Educator

Posted May 15, 2013 at 3:55 PM (Answer #1)

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First, we assume that the gas is ideal. Then, we use the ideal gas law:

`PV = nRT`

where P is the pressure, V the volume, n the number of moles, R the gas constant, and T absolute temperature.

This gives us:

`n = (PV)/(RT)`

Hence, substituting the given values:

`n = (PV)/(RT) = ((750/760)*2)/(0.08206*(24+273)) = 0.081 ` 

Answer is 0.081 moles of oxygen.

 

Note that temperature is in Kelvin, while pressure in atm (1 atm = 760 torr)

 

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