Home Symbol which looks like a small house Up Solid circle with an upward pointer in it

iron oxide


Gas phase thermochemistry data

Go To: Top, Condensed phase thermochemistry data, References, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Quantity Value Units Method Reference Comment
Deltafgas60.000kcal/molReviewChase, 1998Data last reviewed in June, 1965
Quantity Value Units Method Reference Comment
gas,1 bar57.820cal/mol*KReviewChase, 1998Data last reviewed in June, 1965

Gas Phase Heat Capacity (Shomate Equation)

Cp° = A + B*t + C*t2 + D*t3 + E/t2
H° − H°298.15= A*t + B*t2/2 + C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 − E/(2*t2) + G
    Cp = heat capacity (cal/mol*K)
    H° = standard enthalpy (kcal/mol)
    S° = standard entropy (cal/mol*K)
    t = temperature (K) / 1000.

View plot Requires a JavaScript / HTML 5 canvas capable browser.

View table.

Temperature (K) 5000. - 6000.
A 8.650710
B -0.024152
C 0.154889
D -0.016799
E 0.056932
F 57.23490
G 67.76360
H 60.00010
ReferenceChase, 1998
Comment Data last reviewed in June, 1965

Condensed phase thermochemistry data

Go To: Top, Gas phase thermochemistry data, References, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Quantity Value Units Method Reference Comment
Deltafliquid-59.639kcal/molReviewChase, 1998Data last reviewed in June, 1965
Quantity Value Units Method Reference Comment
liquid,1 bar18.02cal/mol*KReviewChase, 1998Data last reviewed in June, 1965
Quantity Value Units Method Reference Comment
Deltafsolid-65.019kcal/molReviewChase, 1998Data last reviewed in June, 1965
Quantity Value Units Method Reference Comment
solid14.52cal/mol*KReviewChase, 1998Data last reviewed in June, 1965

Liquid Phase Heat Capacity (Shomate Equation)

Cp° = A + B*t + C*t2 + D*t3 + E/t2
H° − H°298.15= A*t + B*t2/2 + C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 − E/(2*t2) + G
    Cp = heat capacity (cal/mol*K)
    H° = standard enthalpy (kcal/mol)
    S° = standard entropy (cal/mol*K)
    t = temperature (K) / 1000.

View plot Requires a JavaScript / HTML 5 canvas capable browser.

View table.

Temperature (K) 1650. - 5000.
A 16.30000
B -1.075821×10-10
C 2.856662×10-11
D -2.543741×10-12
E -7.391681×10-11
F -67.26401
G 32.94400
H -59.63960
ReferenceChase, 1998
Comment Data last reviewed in June, 1965

Solid Phase Heat Capacity (Shomate Equation)

Cp° = A + B*t + C*t2 + D*t3 + E/t2
H° − H°298.15= A*t + B*t2/2 + C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 − E/(2*t2) + G
    Cp = heat capacity (cal/mol*K)
    H° = standard enthalpy (kcal/mol)
    S° = standard entropy (cal/mol*K)
    t = temperature (K) / 1000.

View plot Requires a JavaScript / HTML 5 canvas capable browser.

View table.

Temperature (K) 298. - 1650.
A 10.93480
B 4.489850
C -1.422610
D 0.203819
E -0.019423
F -68.53320
G 26.36520
H -65.02010
ReferenceChase, 1998
Comment Data last reviewed in June, 1965

References

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Chase, 1998
Chase, M.W., Jr., NIST-JANAF Themochemical Tables, Fourth Edition, J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]


Notes

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, References