2.50 mol of gaseous
water in a closed container undergoes a change from 130 C to -40 C at a constant
pressure of 1 atm. How do you know what stages to break this into?

Question

2.50 mol of gaseous
water in a closed container undergoes a change from 130 C to -40 C at a constant
pressure of 1 atm. How do you know what stages to break this into?

anonymous · Answer

Unsure what you want from this?

PV = nRT

could help you?

so if your looking for Volume, V then
V = nRT/P = (number of mol x gas constant x Temperature)/ pressure

the increase in volume will then be

V_2 - V_1 = change in V

what do you want from it?

anonymous · Answer

My professor said that it could be done in 5 stages to find the heat of phase change. I'm so confused by this! :/

anonymous · Answer

Looking at a heating-cooling curve.

anonymous · Answer

then I'm unsure maybe this is hellpfull http://chemistry.about.com/od/workedchemistryproblems/a/Heat-Capacity-Phase-Change-Example-Problem.htm

anonymous · Answer

Yeah, that is what we are doing! I just don't get how you know where to break it into stages. Thank you!