Thermodynamics Toolbox

Question 1

ΔG•f

Answer 1

STD molar free energy of formation

Question 2

ΔH•f

Answer 2

STD molar enthalpy of formation of compound from STD state elements, where each element is assumed to be in most thermodynamically stable form

Question 3

S•m

Answer 3

STD molar entropy of substance

Question 4

STD

Answer 4

T = 298 K and P = 1 bar
1 bar ≈ 1 atm
1 bar = 10^5 Pa = 10^5 N/m^2

Question 5

STD Tthermo

Answer 5

298 K

Question 6

Element properties at STD

Answer 6

S•m never equals 0
ΔG•f = 0
ΔH•f = 0

Question 7

•C to K temperature conversion

Answer 7

K = •C + 273

Question 8

Equation for heat energy transferred

Answer 8

q = m ΔT Cp

Question 9

Entropy change for system

Answer 9

ΔSsys = qrev / T

Question 10

Change in free energy

Answer 10

ΔGrxn• = ΣnΔG•fproduct - ΣnΔG•freactant

Question 11

Change in enthalpy

Answer 11

ΔHrxn• = ΣnΔH•fproduct - ΣnΔH•freactant

Question 12

Change in entropy

Answer 12

ΔSrxn• = ΣnΔS•fproduct - ΣnΔS•freactant

Question 13

Change in free energy equation 7

Answer 13

ΔGrxn• = ΔHrxn• - TΔSrxn•

Question 14

Equilibrium Constant

Answer 14

Keq = exp(-ΔGrxn• / RT)

Question 15

Change in free energy electrochemistry

Answer 15

ΔGrxn• = -nFE• cell

Question 16

Hess’s Law of heat summation

Answer 16

ΔHoverallrxn• = ΣΔHsubrxn n•