Question 8.43

Moderators: Chem_Mod, Chem_Admin

Chloe1K
Posts: 23
Joined: Fri Sep 29, 2017 7:05 am

Question 8.43

Postby Chloe1K » Thu Jan 18, 2018 9:58 pm

Can someone please explain why the answer to 8.43 is c, not b? thank you!!

SantanaRodriguezDis1G
Posts: 56
Joined: Sat Jul 22, 2017 3:00 am

Re: Question 8.43

Postby SantanaRodriguezDis1G » Thu Jan 18, 2018 10:02 pm

by looking at the enthalpies you can see that the melting should happen twice as fast as vaporization which is one indication as to why the answer is c

Rachel Formaker 1E
Posts: 86
Joined: Fri Sep 29, 2017 7:04 am
Been upvoted: 2 times

Re: Question 8.43

Postby Rachel Formaker 1E » Fri Jan 19, 2018 9:39 pm

The reason the answer is c) and not b) is because the slopes of the heating curve for the solid and gas phases must be steeper than the slope of the heating curve for the liquid phase. This is because the heat capacity of the liquid phase is higher than the heat capacities of the solid and gas phases.

The slope of a heating curve is steeper for a phase with a low heat capacity than for one with a high heat capacity, so it must be steeper for the solid and gas phases, and less steep for the liquid phase.


Return to “Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)”

Who is online

Users browsing this forum: No registered users and 2 guests