1. Tardigrade
  2. Question
  3. Chemistry
  4. The van der Waals equation for one mole of a real gas can be written as (P + (a/V2))(V - b)=RT . For the gases H2 , NH3 , and CH4 , the value of 'a' bar L- 2mol- 2 are 0.2453, 4.170 and 2.253 respectively. Which of the following can be inferred from the 'a' values?

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Q. The van der Waals equation for one mole of a real gas can be written as $\left(P \, + \, \frac{a}{V^{2}}\right)\left(V \, - \, b\right)=RT$ . For the gases $H_{2}$ , $NH_{3}$ , and $CH_{4}$ , the value of 'a' $bar \, L^{- 2}mol^{- 2}$ are 0.2453, 4.170 and 2.253 respectively.

Which of the following can be inferred from the 'a' values?

NTA AbhyasNTA Abhyas 2020States of Matter

Solution:

Van der Wall's constant 'a' gives information about force of attraction between gaseous molecules. Higher the value of 'a' higher will be force of attraction, and easier the liquefaction of gas. Order of intermolecular force of attraction = $H_{2} < \, CH_{4} < \, NH_{3}$