HW question 8.49

Natalie Yakobian
Posts: 45
Joined: Fri Sep 25, 2015 3:00 am

HW question 8.49

Hi I am very confused with question 8.49

Oxygen dif uoride is a colorless, very poisonous gas that reacts rapidly with water vapor to produce O2, HF, and heat. What is the change in internal energy for the reaction of
1.00 mol OF2?

I know that deltaU = DeltaH - deltanxRxT, and that delta n is 1 based on the difference of gas mol but I can't find a temperature, V, or P in the problem so I don't really understand where to go from here.

Thank you!!

Chem_Mod
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Re: HW question 8.49

We know from the ideal gas law that $pV = nRT$, therefore we can substitute in using the relationship $p\Delta V = \Delta nRT$. Also note that the reaction is performed at standard temperature, 298K.

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