Question on Cv(vap)

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Jessica Nunez 1I
Posts: 58
Joined: Thu Jul 13, 2017 3:00 am

Question on Cv(vap)

Postby Jessica Nunez 1I » Mon Jan 22, 2018 10:22 pm

A pressure cooker containing 100.0 g of liquid water at 25 C is placed on the stove until all water becomes superheated steam at 121 C. Assume no steam escapes the pressure cooker.

a) Find q from 25C to 100C
b) Find q during boiling
c) Find any other heat gained or lot by the water as it goes from 25C to 121C. (Hint: Use Cv (vap) in your calculation involving superheated steam.)

Part C hints to use Cv (vap), but how do we calculate the value of Cv (vap)? Is the value of Cv (vap) supposed to be a constant?

Andy Nguyen 1A
Posts: 56
Joined: Thu Jul 27, 2017 3:00 am

Re: Question on Cv(vap)

Postby Andy Nguyen 1A » Mon Jan 22, 2018 10:27 pm

Cv(vap) is a constant, 2.01 (J/C*g). It was in table 8.2.

Veronica Rasmusen 2B
Posts: 49
Joined: Sat Jul 22, 2017 3:01 am

Re: Question on Cv(vap)

Postby Veronica Rasmusen 2B » Mon Jan 22, 2018 11:33 pm

Cv(vap) is 2.01 (J/C*g) for H2O, it is not something you calculate but will be given, or you can look it up.

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