For one mole of an ideal gas, the slope of $V$ vs. $T$ curve at constant pressure of 2 atm is $X$ L…

For one mole of an ideal gas, the slope of $V$ vs. $T$ curve at constant pressure of 2 atm is $X$ L $\mathrm{mol}^{-1} \mathrm{K}^{-1} .$ The value of the ideal universal gas constant 'R' in terms of $X$ is
  1. $X$ L atm mol $^{-1} \mathrm{K}^{-1}$
  2. $\frac{x}{2}$ L atm $\mathrm{mol}^{-1} \mathrm{K}^{-1}$
  3. $2 X$ L atm $\mathrm{mol}^{-1} \mathrm{K}^{-1}$
  4. $2 X$ atm $L^{-1} \mathrm{mol}^{-1} \mathrm{K}^{-1}$

Solution

At constant pressure and same number of moles, Volume of the gas is the directly proportional to the temperature of the gas. The slope of V versus T graph i.e slope \(=\frac{\Delta \mathrm{V}}{\Delta \mathrm{T}}=\mathrm{X} \mathrm{Lmol}^{-1} \mathrm{~K}^{-1}\) But, \(\frac{\Delta \mathrm{V}}{\Delta \mathrm{T}}=\frac{\mathrm{R}}{\mathrm{P}}\) (no. of moles \(=1\)) Now, \(\mathrm{P}=2\) Therefore, \(\mathrm{R}=2 \mathrm{~X~} \mathrm{L~} \mathrm{atm~} \mathrm{mol}^{-1} \mathrm{~K}^{-1}\) ,

Asked in: JEE-TOPICTESTS-CHEMISTRY

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