Standard molar entropies of elements elements are not

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: hermal Thermal random motion ceases minimal minimal disorder Standard Standard molar entropy S o Standard molar entropy ( So ): the molar entropy ): values of substances at their standard states standard 1. Standard molar entropies of elements elements are not zero not 2. For a substance in different states: Ssolid < Sliquid << Sgas Standard Standard molar entropy S o 3. For different substances: entropies increase with the number of atoms in the formula of substance number SCH3CH3 < SCH3 (CH2 )2CH3 < SCH3 (CH2 )4CH3 4. For different substances: entropies increase with the increasing increasing molar mass. The The molecular interpretation of Entropy S = k ⋅ ln W the more degrees of freedom a molecule has, more molecule greater the greater its entropy. Which one has the greater entropy: (1) 1 mole of HCl (g) or 1mole of Ar (g) (2) 1 mole of H2 (g) at STP or 1mole of H2 (g) at 100°C and 0.5 atm (3) 1 mole of NO2 (g) at STP or 2mole of N2O4 (g)...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online