## H and q

Abigail Sanders 1E
Posts: 112
Joined: Wed Sep 11, 2019 12:16 am

### H and q

How are delta H and q different in terms of heat? In the homework questions these variables are used interchangeably, is there a way to distinguish when you use one or the other and what does each mean?

Connie Chen 1E
Posts: 51
Joined: Mon Jun 17, 2019 7:24 am

### Re: H and q

Delta H refers to the total heat in a system whereas q is the heat that is being transferred. Delta H is equal to q when the pressure is constant, but if the pressure changes, then they are not the same.

Ryan Yoon 1L
Posts: 55
Joined: Mon Jul 01, 2019 12:15 am

### Re: H and q

delta h is the amount of heat released or absorbed at a constant pressure, which is also enthalpy. whereas q is the heat being transferred. they are equal to each other if they are at the same pressure.

Sydney Myers 4I
Posts: 100
Joined: Fri Aug 09, 2019 12:17 am

### Re: H and q

The definition of enthaply is heat at a constant pressure. Q is heat, so the two are highly related. You can tell if delta H and q are the same if q has a subscript of p, meaning that it's the heat at a constant pressure.

Jocelyn Thorp 1A
Posts: 103
Joined: Wed Sep 18, 2019 12:20 am

### Re: H and q

Connie Chen 1E wrote:Delta H refers to the total heat in a system whereas q is the heat that is being transferred. Delta H is equal to q when the pressure is constant, but if the pressure changes, then they are not the same.

this explanation makes a lot of sense, thanks!

Jesse H 2L
Posts: 58
Joined: Fri Aug 09, 2019 12:17 am
Been upvoted: 1 time

### Re: H and q

delta h and q are the same at constant pressure.

Megan Cao 1I
Posts: 103
Joined: Sat Sep 07, 2019 12:18 am

### Re: H and q

delta H is the enthalpy of the reaction, which is the total heat of the system. q is the heat that is transferred. when pressure's constant, delta h = qp.

Jasmine 2C
Posts: 184
Joined: Wed Sep 18, 2019 12:18 am

### Re: H and q

q equals delta H when pressure is constant