the previous answers that I got were allwrong: -5490, 1356, -18.6, 18.6, -18600,

Question

the previous answers that I got were allwrong:
-5490, 1356, -18.6, 18.6, -18600, -1595, -17.6, 17.6
     Grxn. = G Products - G reactants       -5490kJ =   [ 8 x (-394.36) kJ + 10(-237.13) kJ ] - 2 x [ G0f C4H10]          C4H10 = -1595.53 kJ(wrong)
       GC4H10 = -35.2/2 = -17.6Kj/mol(wrong)         The free energyof formation of C4H10 is -1595.53 kJ      Grxn. = G Products - G reactants       -5490kJ =   [ 8 x (-394.36) kJ + 10(-237.13) kJ ] - 2 x [ G0f C4H10]          C4H10 = -1595.53 kJ(wrong)
       GC4H10 = -35.2/2 = -17.6Kj/mol(wrong)         The free energyof formation of C4H10 is -1595.53 kJ

Explanation / Answer

i carefully calculated again and got this: -5490 = [-3154.88 - 2371.3 ] - 2 [ G0f C4H10 ] -5490 + 5526.18 =  - 2 [ G0f C4H10 ] [ G0f C4H10 ] = - 5490 +5526.18/-2 [ G0f C4H10 ] = - 5490 + 5526.18/-2 =-18.09Kj/mol

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