gas constant R

[Audrey Kang 2I]

Does it matter which gas constant we use if units are not specified for pressure?

[Christina Pham 3H]

I believe units must be given for pressure because otherwise how would you choose R? Since pressure can be expressed in: atm, bar, pa, tor, etc. units have to be given to properly use PV=nRT to convert to molarity.

[Anne Cam 3A]

The units of pressure would need to be given. If pressure is in atm, then use R = 0.08206 L*atm/K*mol to cancel out. If pressure is in bar, the unit for R would be L*bar/K*mol, and for torr it is L*torr/K*mol.

[Samiksha Chopra 2I]

There have been a couple of questions that do not specify the units for pressure. I believe that you can use whichever value for R that is easiest for you, just make sure you are clear that your final answer or numbers chosen corresponds directly to the value of R that you used.

[Victor Qiu 1C]

Yes, it depends on the units.

There are 4 values that are used more often:
R = 0.0821 L·atm/(mol·K) = 8.3145 J/(mol·K) = 8.2057 m3·atm/(mol·K) = 62.3637 L·Torr/(mol·K)

[Evonne Hsu 1J]

To determine which gas constant to use, you would refer back to the question and find the units that they are using. For example, If the pressure is in atm, then you can use R = 0.08206 L*atm/K*mol. However, if the pressure is in bar, you can use R = L*bar/K*mol and so on.

[Edgar Velazquez 2K]

It will matter since not all the values are the same. If the pressure units aren't specified, you should look at all the other units in the problem so you can see which value is best for canceling the rest of them out.

[Laura 3l]

I'm pretty sure you would have to know the units for pressure.

[Ryan Agcaoili 2E]

It is important to know the differing units for the gas constant R because it can differ depending on what the question is asking for.

[Ziyan Peng 3A]

make sure you keep in mind what units are in the question and use the correct value in the context :)

[Jaden Joodi 3J]

As long as the units cancel, and you convert to whatever the answer is looking for, it should always work!

[Mehreen 3I]

The units of pressure will most likely be given and you want to make sure you are using the right units throughout while you solve a problem. Hope this helps!

[Bai Rong Lin 2K]

Using the right unit that is given in the question and solving it throughout would be useful.

[Nicole Critzer 2L]

Usually the units are specified but if they're not specified as long as the units cancel out you should be able to use whichever you like.

[Mina Tadros 3L]

As long as the units cancel and you end up with the correct unites you are looking for, then it does not matter.

[Mansi Solanki 3A]

Depending on the units given in the problem and equation that you are using, the R constant will change. Usually, you can tell from the problem.

[Diana Aguilar 3H]

It is important to know what units are given to you in the question to see what value you have to use, but as long as your units cancel out and you have the correct units at the end then you should be fine.

[Jose Miguel Conste 3H]

units will always be significant when using gas constant R

[YuditGaribay3J]

There are several units that represent R, I say it's best to look at the units and see which one would be the most ideal to use. For example we have: 8.314 J*K^-1*mol^-1, 8.206*10^-2 L*atm*K^-1, and 8.314 *10^-2 L*bar*K^-1*mol^-1