Entropy 2 Flashcards
1
Q
How does size affect entropy?
A
The larger something is, the greater the entropy
2
Q
What is the entropy value of diamond?
A
2.4Jmol-1K-1
3
Q
What is ΔG?
A
Free energy change
4
Q
Calculate ΔS for
Fe2O3(s) + 3H2(g) —> 2Fe(s) + 3H2O(g)
Fe = 27
H2O = 189
Fe2O = 90
H2 = 137
A
ΔS = ∑ΔSproduct - ∑ΔSreactant
ΔS = ((2x27)+(3x189)) - 90 + (3x137) = 120JK-1mol-1
5
Q
What are born-haber cycles?
A
Enthalpy cycles, based on Hess’s law, that allow us to determine enthalpy changes involved in formation of ionic compounds
6
Q
Equation example for enthalpy of hydration
A
Na+(g) + aq —> Na+(aq)
