## Determining what is constant

$\Delta G^{\circ} = -nFE_{cell}^{\circ}$

charlotte_jacobs_4I
Posts: 63
Joined: Fri Sep 28, 2018 12:29 am

### Determining what is constant

How do you decide what is at a constant with out it being said. I have run into questions that don't talk about volume then the answer seems to imply that is is constant. How is this determined? Are there any rules informing you on how to decide? What happens if nothing is stated?

Kriti Goyal 4K 19
Posts: 32
Joined: Fri Sep 28, 2018 12:21 am

### Re: Determining what is constant

Most of the time, it is stated if there is a change. Like if there isa change in volume or temperature, the question will state that it went from this value to this value. But if its just a single value given, it is assumed its constant because there is no change indicated, unless ofcourse we need to calculate the change.
Its a similar thing for pressure, but there is also an additional factor, if . reaction takes place in an open container, pressure is usually taken constant at 1atm.

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