## change in entropy

$\Delta S = \frac{q_{rev}}{T}$

Sarah Blake-2I
Posts: 153
Joined: Fri Aug 30, 2019 12:16 am

### change in entropy

When using delta S = q/t, why can we use change in enthalpy (delta H) over T as well? Also how do you just calculate delta H? The solutions manual is showing that you do the moles multiplied by another value that you look up, but I am not sure what the meaning of that value is. An example of what I am trying to ask is for 4F.13 in the textbook.

TimVintsDis4L
Posts: 104
Joined: Sat Aug 17, 2019 12:17 am

### Re: change in entropy

I don't know the first part to your question, but I do know the equation used to calculate enthalpy.

$\Delta H = m s\Delta T$

The Delta H = Change in Enthalpy

The m = mass

The s = heat

and the Delta T = the temperature change

Viviana Velasquez
Posts: 97
Joined: Sat Jul 20, 2019 12:15 am

### Re: change in entropy

You can us delta H instead of q because at constant pressure, q(p)= delta H

KBELTRAMI_1E
Posts: 108
Joined: Sat Jul 20, 2019 12:17 am

### Re: change in entropy

Viviana Velasquez wrote:You can us delta H instead of q because at constant pressure, q(p)= delta H

What is the significance of this notation? Would we be marked down for using q?