How to calculate from janaf table:

1)0( 0.1 ) = 0= 0 + 0() 0() . 0()

0() 3 . ;

0() 0() 5 ;0 6

Read JANAF data table.

2) 0( ) = 0( 1 ) +.. log ( 100) R = 8.31451

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Sample Case calculation for Hydrogen(H):

0 = 230.776

; 0() 0() = 66.554; 0() = 165.911 /

0( ) = 230.776 + 66.554 3500165.9111000 = 283.3585

0.1 0( , = 51.7 ) = 0( ) + .(51.7100)1000 =-283.3585-8.337=-291.6961kJ/mole Hence

0(, ). = 291.696129.10 = 10.0236

Sample for oxygen (O)

0 = 257.169 ; 0() 0() = 67.079 ; 0() = 212.943 /

0( ) = 257.169 + 67.079 3500212.9431000 = 421.052 0.1

0( , = 51.7 ) = 0( ) + .(51.7100)1000 =-421.052-8.337=-429.3896 kJ/mole Hence

0(, ). = 429.380629.10 = 14.755

Sample calculation for Hydrogen(H2):

0 = 0 ; 0() 0() = 107.555 ; 0() = 208.69 / 0( ) = 0 + 107.555 3500208.691000 = 622.86 0.1 0( , = 51.7 ) = 0( ) + .(51.7100 )1000 = 622.86 8.3376= 631.197/

Hence 0(, ).( ) = 631.19729.10 = 21.69