# Chemistry

posted by .

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...

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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