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The specific heat of helium at constant ...

The specific heat of helium at constant volume is `12.6 Jmol^(-1)K^(-1).` The specific heat of helium at constant pressure in `Jmol^(-1)K^(-1)` is about
(Assume the temperature of the gas is moderate, universal gas constant, `R=8.314 J mol^(-1)K^(-1)`

A

12.6

B

16.8

C

18.9

D

21

Text Solution

Verified by Experts

The correct Answer is:
D
`C_(v)=12.6 J mol^(-1)K^(-1)`
`C_(p) = ?`
`C_(p) - C_(v) = R`
`implies` `C_(p) = 12.6 + 8.314`
`therefore` `C_(p) =` 20.914 ` cong` 21
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Knowledge Check

  • What is the value of gas constant R in J mol^(-1 ) K^(-1) ?

    A
    82.1
    B
    `8.314 xx 10^7`
    C
    `8.314`
    D
    `0.0821 9`.

  • What is the numerical value of the gas constant R- in J mol^(-1) K^(-1) ?

    A
    0.0821
    B
    `803140 xx 10^(7)`
    C
    8.314
    D
    1.987

  • The molar specific heat of a gas at constant volume is 20 Joule/gm mol/K. The value of gamma for it will be

    A
    `11//10`
    B
    `7//5`
    C
    `5//3`
    D
    `3//2`

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