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Energi ikatan rata-rata C-N, O-H, dan C=O berturut...

Energi ikatan rata-rata C-N, O-H, dan C=O berturut-turut adalah 305, 467, dan 745 kJ.mol−1.

CO2(g) + 2NH3(g) → (NH2)2CO(g) + H2O(g)    ΔH = −17 kJ.mol−1

Energi ikatan rata-rata N-H dalam kJ.mol−1 adalah ….
 

  1. 391

  2. 782

  3. 945

  4. 1527

  5. 2346

Jawaban:

begin mathsize 14px style Jika space diketahui space energy space ikat comma space maka space colon end style

 

O=C=O    +

2 Image result for struktur NH3

 

à

 Image result for struktur urea

 

+ H–O–H

begin mathsize 14px style ΔH space equals space left parenthesis jumlah space energy space ikat space reaktan right parenthesis space – space left parenthesis jumlah space energy space ikat space produk right parenthesis  space space space space space space equals space left parenthesis 2 left parenthesis straight C equals straight O right parenthesis space plus space 6 left parenthesis straight N – straight H right parenthesis right parenthesis space – space left parenthesis left parenthesis straight C equals straight O right parenthesis space plus space 2 left parenthesis straight C – straight N right parenthesis space plus space 4 left parenthesis straight N – straight H right parenthesis space plus space 2 space left parenthesis straight O – straight H right parenthesis right parenthesis space space space space space space space space space left parenthesis yang space sama space bisa space di space eliminasi right parenthesis  space space space space space space equals space left parenthesis left parenthesis straight C equals straight O right parenthesis space plus space 2 left parenthesis straight N – straight H right parenthesis right parenthesis space – space left parenthesis 2 left parenthesis straight C – straight N right parenthesis space plus space 2 space left parenthesis straight O – straight H right parenthesis right parenthesis  – 17 space equals space left parenthesis left parenthesis 745 right parenthesis space plus space 2 left parenthesis straight N – straight H right parenthesis right parenthesis space – space left parenthesis 2 left parenthesis 305 right parenthesis space plus space 2 left parenthesis 467 right parenthesis right parenthesis space space space space space space space  – 17 space equals space left parenthesis left parenthesis 745 right parenthesis space plus space 2 left parenthesis straight N – straight H right parenthesis right parenthesis space – space left parenthesis 610 space plus space 934 right parenthesis space space space space  – 17 space equals space left parenthesis left parenthesis 745 right parenthesis space plus space 2 left parenthesis straight N – straight H right parenthesis right parenthesis space – space left parenthesis 1544 right parenthesis space space space space space space space  2 left parenthesis straight N – straight H right parenthesis space equals space – space space 17 space plus space 1544 space – space 745  straight N – straight H space equals 782 over 2 space equals space 391 space straight g divided by mol end style 

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