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March 27, 2017

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Hi!

I have another question.

So 1 kcal of heat is added to 1.5 L of oxygen in a container at constant pressure. (1atm). Then volume increases to 3.1L. they want to know total energy change.

Now i think the formula is DH=DU + PDV
so what i did was DH = 1 kcal + 1atm(3.1-1.5) = 2.6 kcal...

its wrong... i don't know why please help!

thanks again!

  • Chemistry - ,

    Be careful with units and signs:

    1) 1 L•atm = 24.2 calories
    2) P•∆V work is done by the gas against the surroundings so it is negative:

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