Assuming ideal gas

[Katie Frei 1L]

When can we assume that a gas is behaving in an ideal manner? For example, in 4D.7) of the 7th edition of the textbook, the solutions manner uses the ideal gas equation to solve for the work, and eventually the change in internal energy (but the book never says that the gas is ideal). How would I know to use the ideal gas law in this type of instance?

[CHEM 14B Lover]

I think a lot of questions just require you to think the gas is ideal to apply formulas. IRL lot of energy is lost to heat or sound etc. so even if it's not stated explicitly you basically assume gas is ideal all the time.

[Tameen Ahmed 4C]

I think you assume the question is referring to an ideal gas unless otherwise stated!

[Mark 1D]

should usually assume, sometimes question also mentions it explicitly