PV=nRT equation manipulation

[Matt Sanruk 2H]

What was the purpose of changing the equation to equal P or the concentration? Will this be further manipulated when we deal with equilibrium?

[Anisha Chandra 1K]

If you manipulate the equation to solve for P or concentration, then you can use the resulting pressure or concentration in when calculating Kc (concentration) or Kp (pressure).

[ELu 1J]

I think the purpose is just based on the context of the problem. The problem could give the initial concentration of a gas but then ask you to find the partial pressure at equilibrium or something that requires you to be able to convert one to another when the substance is a gas.

[Qiu Ya Wu 4I]

We move elements of the equation around to solve for P and the concentration so we can convert the partial pressure of a gas to its concentration. Being able to do so will be helpful when we deal with heterogenous equilibria.

[Callum Guo 1H]

You can change the equation around so that you can find the pressure of elements which helps you find the equilibrium for gases

[Matt Sanruk 2H]

Ok I see, but there won't be any problems that give both concentration and pressure for different elements right?

[andrewcj 2C]

If there were, would that be a problem? Assuming the gas constant R was given in the correct units and the temperature was specified, I would think there would be enough information to solve a problem even if both partial pressures and concentrations were part of the information provided.

[RobertXu_2J]

We are manipulating the equation so that we can calculate the value that we want. For example, if we wanted concentration, which is n/V, we would move it to one side and everything else on the other side.

[Angela Prince 1J]

Ok I see, but there won't be any problems that give both concentration and pressure for different elements right?

manipulating the ideal gas law equation gives us a way to convert either partial pressure to concentration or vice versa. so, even if a problem provides values both ways, we should be able to convert them all to the same units.

[Matt Sanruk 2H]

Oh, I see this manipulation can come in handy whenever we are given these circumstances thanks.

[Nicholas_Gladkov_2J]

What was the purpose of changing the equation to equal P or the concentration? Will this be further manipulated when we deal with equilibrium?

The purpose of manipulating PV=nRT is purely to acquire the information that is asked for in the problem, as well as to understand certain concepts. Solving for concentration (n/V) can help understand how changing temperature has on that concentration.

[smurphy1D]

Is R a constant in every equation? Or does it differ depending on the chemical equation ?

[gabbymaraziti]

Manipulating the PV=nRT is helpful because P gives the partial pressure of gases, which we can use when the problem provides us only with molar concentrations.

[Matt Sanruk 2H]

Is R a constant in every equation? Or does it differ depending on the chemical equation ?

yes I believe it is a constant but I do not know the number since it is in bar not atm