Posted by **kate** on Monday, January 3, 2011 at 9:34pm.

A rigid tank contains 0.40 moles of oxygen (O2). Determine the mass (in kg) of oxygen that must be withdrawn from the tank to lower the pressure of the gas from 37 atm to 23 atm. Assume that the volume of the tank and the temperature of the oxygen are constant during this operation.

- physics/chemistry -
**bobpursley**, Monday, January 3, 2011 at 9:36pm
easy, do it as a proportion.

(.4-x)/.4=23/37

solve for x.

- physics/chemistry -
**kate**, Monday, January 3, 2011 at 9:54pm
i am getting .15 and .24 and i keep getting it wrong. i dont know what im doing wrong.

- physics/chemistry -
**DrBob222**, Monday, January 3, 2011 at 10:05pm
0.15 moles oxygen is correct for the amount to be withdrawn. The problem asks for kg; therefore, multiply 0.15*32 to obtain grams, divide by 1000 to convert to kg, then round to the correct number of significant figures.

- physics/chemistry -
**kate**, Monday, January 3, 2011 at 10:06pm
oh, ok. that makes sense. Thanks!

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