Determining temperature of a reaction (7.51)

[K Honeychurch 1K]

Problem 7.51 asks for the change in internal energy for the reaction of 1.00 mol OF₂ with hydrogen that produces O₂ and HF. When calculating the work you use the ideal gas law PV=nRT. What I don't understand is how you determine temperature if it is not given in the problem. The solutions manual uses 298 K as the temperature. Where did that come from? Thanks.

[Niharika Reddy 1D]

I think we assume the temperature is 298 K when it is not stated because page 265 in the textbook says most thermochemical data are reported for 25° C, which is 298.15 K. It also says all reaction enthalpies used in the textbook are for 298.15 K unless otherwise indicated.