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The critical temperature of NH(3) and SO...

The critical temperature of `NH_(3) and SO_(2)` gases are 405.0 K and 430.3K, respectively. For which gas is the value of van der waals constant 'a' greater. And why?

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The higher the critical temperature of a gas, the stronger of its intermolecular forces of attraction, and hence the larger the value of van der waals constant 'a' the gas has. Thus, between `NH_(3)` and `SO_(2)`, the value of a will be larger for `SO_(2)` because its critical temperature is higher than that of `NH_(3)`.
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CHHAYA PUBLICATION-STATES OF MATTER : GASES AND LIQUIDS-WARM UP EXERCISE
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