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Comparing Molar Entropies

Posted: Sun Feb 11, 2018 9:37 pm
by torialmquist1F
What do we look for when deciding which has higher molar entropy?
For example, why can we say that Lead has a higher molar entropy than Carbon?

Re: Comparing Molar Entropies

Posted: Sun Feb 11, 2018 9:40 pm
by Curtis Wong 2D
Mainly due to higher molar mass and complexity of the atom/molecule. Typically, the more complex an object is, the more entropy it has due to more "disorder" or orientations that it could potentially have. Lead has more entropy than carbon due to having more particles in its atom than carbon.

Re: Comparing Molar Entropies

Posted: Sun Feb 11, 2018 9:42 pm
by Nishma Chakraborty 1J
Hey!

So typically, larger, more complex molecules have a higher molar entropy than simpler ones, because there are more possible arrangements of atoms within a larger molecule. Also, gases have a greater molar entropy than liquids, and liquids have a greater molar entropy than solids. All else equal, the species with a higher molar mass will have a greater molar entropy- which is why Lead has a higher molar entropy than Carbon.

Hope this helps! :)