Determine the Urms of O2 at 27°c? Sir the question is how can I know which value of R (gas constant) is to be used where? Because it's 1st value is of L-atm, 2nd is of J and 3rd is of cal. So how should I know which value shall be applied where?

Open in App

Solution

Check the values of the other things used. examples for PV = nRT check the values of P and V for knowing which value of R to use. if P is in atm and V is in L then the value should be the 1st one if P is in Pascal and V in m^3 then the value should be 2nd one and the values in calories can be easily changed to J so that should not be any problem. And in the case given by You, velocity is to be found in SI units so the here the value of R in SI units is the 2nd one so the use the 2nd one when asked for Urms.

Suggest Corrections

Similar questions

Determine the value of ∆H and ∆U for the reversible isothermal evaporation of 90.0g of water at 100°C. Assume that water vapour behave as am ideal gas and heat of eveporation of water is 540cal.

MY PROBLEM

Only tell me How ∆H is calculated here, because if I know∆H then I can use the equation

∆H = ∆U + nRT

In my book it is given that

∆H = 90.0 x 540

= 48600 cal

But I want to know that why they have multipled the mass to heat of eveporation to find out ∆H

Hello,

I'm pretty confused what is the value of R (Gas constant) 8.31 or 0.0831 why do we use different values ,And on what basis should we determine which value of R to be used

Please help !

We know that Ohm Law is V = IR

PROBLEM -

Suppose I take a conducting Rod and let us say that it's one end is A and other is B. Suppose I give a potential difference at A of quantity V and initally my rod resistance is R when the length of rod is L.

What will happen to V and I if I increase the resistance of rod by increasing or decreasing length?

To balance the equation V = I R who will change the value V or I.

MY APPROACH---

What I think is that V can't change since it is a constantly given by source (assumed) so I think value of I will decrease.

This question is borned out of my mind so I also do not know ''Is questions I have uploaded is meaningless?'

Help me in finding correct answer.

In my problem there is no image because I don't think it is necessary and I have assumed a constant temperature.

Q. Good morning sir/ mam
how we can change the state of a matter by lowering the pressure?
How can a low pressure be applied?
As I only know how the pressure is increased but how decrease?
Thank you

Q. A gas is present at a pressure of

2 atm

. What should be the increase in pressure so that the volume of the gas can be decreased to

\frac{1}{4} th

of the initial value, if the temperature is maintained constant?

Join BYJU'S Learning Program