Focus 4.1

[Eileen Quach Dis 2A]

For focus problem 4.1, I was wondering why we can use delta H to calculate heat absorbed for each step of the reaction. Why can we assume that heat absorbed was at a constant pressure when it wasn't mentioned?

[Courtney Situ 2B]

I don't really have a definite answer other than there's no other way to do the problem. I think this is just one of those situations where you have to make the correct assumptions or act on the provided information.