## Heat Capacity Units (8.43)

Moderators: Chem_Mod, Chem_Admin

Hannah Chew 2A
Posts: 76
Joined: Fri Sep 29, 2017 7:05 am
Been upvoted: 2 times

### Heat Capacity Units (8.43)

Hi, I am confused about the heat capacity units in 8.43. The book says that the heat capacity for a solid is 30 J/mol and for a liquid, it is 60J/mol. What does "J/mol" exactly mean, and what does it say about the temperature? I thought that heat capacity was J/ unit of temperature, so why is this unit different?

I understand that enthalpy of vaporization and fusion are kj/mol, which tells us how much energy is needed to melt and vaporize a mol of said substance, but what about just "regular" heat capacity?

Mike Vinci 2B
Posts: 49
Joined: Fri Sep 29, 2017 7:03 am
Been upvoted: 1 time

### Re: Heat Capacity Units (8.43)

What's going on Hannah! Molar specific heat is usually shown in Joules per mol or KJ per mole depending on how you want to express it. It represents the amount of heat needed (in Joules or KJ) to raise the temperature of 1 mole of something, by 1 Kelvin. I remember reading that this idea might depend on the presence of phase changes, where you can only use it given that there are no phase changes taking place. However, I'd be interested for others feedback.

Hannah Chew 2A
Posts: 76
Joined: Fri Sep 29, 2017 7:05 am
Been upvoted: 2 times

### Re: Heat Capacity Units (8.43)

Isn't molar heat capacity J/Kmol ? In this problem, why doesn't the Kelvin appear?

Return to “Heat Capacities, Calorimeters & Calorimetry Calculations”

### Who is online

Users browsing this forum: No registered users and 4 guests