Question

Delta H_comb for benzoic acid can be calculated by Delta H=(C_system Delta T)/n, where n is the moles of benzoic acid in the sample and C_system is the heat capacity of the calorimetric system. If the accepted value for the heat of combustion for benzoic acid is 3226 kJ/mol, calculate the heat capacity (C_system) of the calorimetric system

Answer 1

Delta T is 3 and moles is 0.0074

Answer 2

I don't know how to do that. sorry

Answer 3

Okay, thanks for looking

Answer 4

yw. I never heard of that delta H stuff

Answer 5

\[
\Delta H_{comb}=\frac{C_{system}}{n}
\]So you're given \(\Delta H_{comb}\) and they want \(C_{system}\)?
Don't you need \(n\)?

Answer 6

Oops its:\[
\Delta H_{comb}=\frac{C_{system}\Delta T}{n}
\]

Answer 7

Yes, it says that n is the number of moles and in the before question I had to find it and I got 0.0074 g/mol

Answer 8

So you need change in temperature?

Answer 9

It's just asking to solve for C_system with Delta T being 3, n being the moles : 0.0074, and I think Delta H is 3226 kJ/mol

Answer 10

If you solve for \(C_{system}\) I think you get:\[
\frac{n\Delta H }{\Delta T}=C_{system}
\]

Answer 11

Okay, then do I plug in the numbers to get what C is?

Answer 12

Yes, just gotta look out for units.

Answer 13

\[\frac{ 0.0074(3226) }{ 3 } = C _{system}\] like this?

Answer 14

Yeah,

Answer 15

Okay, I got 7.957

Answer 16

Honestly I am fuzzy on this subject so I can't say if it's correct or not.

Answer 17

Okay, well thanks for your help though