Chemistry URGENT

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consider the following container of helium at 45C. intially the valve is closed. After the valve is opened what is the pressure of the helium gas.
your start points are 2.00 atm and 9.00L.
after opening you have 3.oo atm and 3.00L.
The answer is 2.25 atm
what formula did you use to come to this conclusion.
Please help I missed a few days and I'm confused.

  • Chemistry URGENT -

    Not only are you confused, surely you didn't post all of the question. You need to rephrase the question so that it is clear.

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