Knowing when there are standard conditions

[Elena Chen 2E]

Hi, I'm a little confused on a part of the second problem that Dr. Lavelle goes over in the last lecture (#27). He says that we know the reaction is happening under standard conditions and at constant pressure because the problem gives us the delta Hº. Can someone explain why this is?

Thanks!

[gabbi_r2C]

I'm pretty sure Dr. Lavelle was referring to how delta Hº means the standard reaction enthalpy, and if you're not given any other information but standard values, you assume the reaction occurs under standard conditions. I hope this helps!

[SophiaBarden 2E]

Normally when doing these types of problems, it is safe to assume something is under standard conditions unless stated otherwise! Keep an eye out for Tmperature or Pressures that are not in standard condition values!!