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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: Kate on December 06, 2009, 09:11:05 AM

Title: Entropy
Post by: Kate on December 06, 2009, 09:11:05 AM

Hi. :) How do I know which substance, between CH₃CH₂OH (liquid) and CH₃OCH₃ (liquid) at the same conditions of pressure and temperature, has a higher value of entropy ?

My answer would be CH₃OCH₃ (liquid) since both have the same molar mass but CH₃OCH₃ has weaker intermolecular forces compared to CH₃CH₂OH.

Is this right ?

Title: Re: Entropy
Post by: JEE10 on December 06, 2009, 09:29:43 AM

The less organised the molecule, or the more disordered, the more is its entropy

Ethanol has intermolecular H-bonding, so we can expect it to be more organised than dimethyl ether. Hence it probably has less entropy than dimethyl ether

So I would say that you are correct

Title: Re: Entropy
Post by: Kate on December 06, 2009, 09:55:18 AM

Thanks. :)

Another question: why does diamond have a higher value of entropy than graphite ?

Title: Re: Entropy
Post by: cliverlong on December 07, 2009, 05:36:58 AM

Quote from: Kate on December 06, 2009, 09:55:18 AM

Thanks. :)

Another question: why does diamond have a higher value of entropy than graphite ?

What values do you have?

Where do you get your data from?

Clive