Critical temperature of NH_(3) and SO_(2) are 405.0 and 430.3 K respectively. Which one will have higher value of van der Waals constant 'a' and why ?

Critical temperature of NH_(3) and SO_(2) are 405.0 and 430.3 K respec

1.	Critical temperature of NH_(3) and SO_(2) are 405.0 and 430.3 K respectively. Which one will have higher value of van der Waals constant 'a' and why ?
Answer» Solution :Higher the critical TEMPERATURE, more EASILY the gas is liquefied, i.e., greater are the intermolecular forces and hence greater is the VALUE of 'a'. THUS, 'a' will be greater for `SO_(2)`.