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  • Need clarity, kindly explain! - States of matter - JEE Main

Value of gas constant  R is

  • Option 1)

    0.082\: litre \: atm\:

  • Option 2)

    0.987\: cal \: mol^{-1}K^{-1}

  • Option 3)

    8.3J\: mol^{-1}K^{-1}

  • Option 4)

    83\: erg\: mol^{-1}K^{-1}

 

Answers (2)

As we learnt in

Ideal Gas Law -

PV=nRT

- wherein

P - Pressure

V - Volume

n - No. of Moles

R - Gas Constant

T - Temperature

 

 

 

 

Units of R

(I)    In atm lit  \Rightarrow 0.0821 atm litre mol-1 k-1 

(II)    In calories \Rightarrow 1.987 cal mol-1 k-1 

(III)    In MKS \Rightarrow 8.314 J mol-1 k-1 

(IV)    iN CGS \Rightarrow\ \; 8.314\times 10^{7} erg\ mol^{-1}k^{-1}

Correct option is 3. 


Option 1)

0.082\: litre \: atm\:

This is an incorrect option.

Option 2)

0.987\: cal \: mol^{-1}K^{-1}

This is an incorrect option.

Option 3)

8.3J\: mol^{-1}K^{-1}

This is the correct option.

Option 4)

83\: erg\: mol^{-1}K^{-1}

This is an incorrect option.

Posted by

Vakul

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