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?

Question

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? (A) NH3 can be most easily liquified (B) H2 can be most easily liquified (C) value of 'a' for CH4 is less than that of NH3 because it has the lower molar mass (D) intermolecular forces are the strongest in hydrogen

Tardigrade Admin · Accepted Answer

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 = H2 < CH4 < NH3

$N H_{3}$ can be most easily liquified

$H_{2}$ can be most easily liquified

value of 'a' for $C H_{4}$ is less than that of $N H_{3}$ because it has the lower molar mass

intermolecular forces are the strongest in hydrogen

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 = $H_{2} < C H_{4} < N H_{3}$

Q. The van der Waals equation for one mole of a real gas can be written as (P+V2a​)(V−b)=RT . For the gases H2​ , NH3​ , and CH4​ , the value of 'a' barL−2mol−2 are 0.2453, 4.170 and 2.253 respectively. Which of the following can be inferred from the 'a' values?

NH3​ can be most easily liquified

H2​ can be most easily liquified

value of 'a' for CH4​ is less than that of NH3​ because it has the lower molar mass

intermolecular forces are the strongest in hydrogen

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 = H2​<CH4​<NH3​

$N H_{3}$ can be most easily liquified

$H_{2}$ can be most easily liquified

value of 'a' for $C H_{4}$ is less than that of $N H_{3}$ because it has the lower molar mass

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 = $H_{2} < C H_{4} < N H_{3}$