## ΔH and ΔU

$\Delta U=q+w$

Noh_Jasmine_1J
Posts: 71
Joined: Fri Sep 28, 2018 12:15 am

### ΔH and ΔU

what does the degree symbol mean in the equation ΔU°=ΔH°+W

Emily Ng_4C
Posts: 65
Joined: Fri Sep 28, 2018 12:17 am

### Re: ΔH and ΔU

Since delta H and delta U values can differ depending on the conditions the reaction is happening in, the degree symbol tells us that the reaction is happening under a standard condition of 1atm.

Jessica Chen 1F
Posts: 61
Joined: Fri Sep 28, 2018 12:17 am

### Re: ΔH and ΔU

The degree symbol means that the reaction is happening in the standard state, which is at 1atm and 298.15K (or 25°C).

Ray Guo 4C
Posts: 90
Joined: Fri Sep 28, 2018 12:15 am

### Re: ΔH and ΔU

And if concentration is concerned, it would be 1M.

Aili Ye 4L
Posts: 58
Joined: Fri Sep 28, 2018 12:16 am

### Re: ΔH and ΔU

The degree symbol means that the reaction is taking place under STP (standard temperature and pressure) conditions.

Rhay Flores 4K
Posts: 11
Joined: Fri Sep 29, 2017 7:04 am

### Re: ΔH and ΔU

the degree symbol indicates that it's happening at STP.

Calvin Patel 2H
Posts: 37
Joined: Fri Sep 28, 2018 12:22 am

### Re: ΔH and ΔU

The degree symbolizes that it is occurring at standard conditions of 1atm. There can be instances where there is no degree symbol and that means that there is a change in the standard conditions.