Constant Pressue

[taywebb]

If the problem does not note a pressure change can we assume that no change in pressure was made?

[Rami_Z_AbuQubo_2K]

Most of the time it will given an indicator that pressure has not changed, but in the case that it doesn't, I think it is safe to assume that there is not pressure change. With that being said, just read the problem carefully.

[Iona Pay]

Yes, that's usually fine. Another indicator that pressure might be constant is if the problem mentions "standard conditions" - this implies a constant temperature of 273K and a constant pressure of 1 atm.

[Dong Hyun Lee 4E]

Yes if there is no mention of a pressure change, it is usually safe the assume that the pressure is being kept constant.