Question

what are the values of R again? 0.0821 is one. what is the other one?

Answer 1

8.3144621 J/K per mole

Answer 2

mentioned by you : R =0.08205746 L atm K−1 mol−1

Answer 3

@lgbasallote got it?

Answer 4

PV = nRT

R = universal gas constant

Answer 5

wait what is the unit of that 8.31 thingy?

Answer 6

J/ K per mole : \(\large{J K^{-1} mol^{-1}}\)

Answer 7

\[\huge \frac{J}{K \cdot \text{mol}}\]
that?

Answer 8

Yes . \[\large{\frac{J}{mol K}}\]

Answer 9

when is it used?

Answer 10

PV = nRT

Answer 11

Using the value of R we can calculate the rest variables..

Answer 12

i meant when is 0.0821 used and when is 8.31 used?

Answer 13

you there @mathslover ?

Answer 14

Oh sorry i was there away for some time ..

actually 0.0821 and 8.31 ... are both R but have diff. units

They are both used in PV=nRT

Answer 15

actually R has several values dependent on : units

Answer 16

these are the values

Answer 17

hmm i just need to know these two and when they're used

Answer 18

do you kknow when?

Answer 19

they are both used in PV=nRT formula

dependent on the units .. for example we have units of RT something similar to 0.0821 unit .. then we use this
and if the units are like J k^-1 mol^-1 then we use 8.31

Answer 20

huh?

Answer 21

isnt there a specific sceneraio?

Answer 22

scenario*

Answer 23

yes there is : but available on wikipedia ..

Answer 24

Well i can give you summary :

1) R has several values .. for example 1 m = 100 cm = 1000 mm and so o n

similarly R has several values dependent on units

2) Use of 0.081 and 8.31 -->

Both can be used in the formula : PV=nRT

it depends on units given for example : we generally use 2 second to calculate speed if distance =4 m .

similarly here .. we will use that value which satisfies result

Answer 25

I hope that it helps you

Answer 26

hmm okay...i guess i'll just fully understand when i see it in action

Answer 27

.. hmn yes .. why not do some practice problems on that?

Answer 28

best of luck