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Data nilai energi ikatan rata-rata diketahui sebagai berikut. CH 2 ​ H 6 ​ ( g ) + Cl 2 ​ ( g ) → C 2 ​ H 5 ​ Cl ( g ) + HCl ( g ) Nilai entalpi reaksi di atas adalah ....

Data nilai energi ikatan rata-rata diketahui sebagai berikut. 

Nilai entalpi reaksi di atas adalah ....

  1. + 218 kJ begin mathsize 14px style mol to the power of short dash 1 end exponent end style

  2. - 218 kJ begin mathsize 14px style mol to the power of short dash 1 end exponent end style

  3. + 109 kJ begin mathsize 14px style mol to the power of short dash 1 end exponent end style

  4. - 109 kJ begin mathsize 14px style mol to the power of short dash 1 end exponent end style

  5. + 89 kJ begin mathsize 14px style mol to the power of short dash 1 end exponent end style

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S. Lubis

Master Teacher

Mahasiswa/Alumni Universitas Sumatera Utara

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Pembahasan

begin mathsize 14px style Persamaan space reaksi space colon space space  straight C subscript 2 straight H subscript 6 left parenthesis straight g right parenthesis end subscript space plus space Cl subscript 2 left parenthesis straight g right parenthesis end subscript space rightwards arrow space straight C subscript 2 straight H subscript 5 Cl subscript left parenthesis straight g right parenthesis end subscript space plus space HCl subscript left parenthesis straight g right parenthesis end subscript end style

begin mathsize 14px style Karena space menggunakan space data space energi space ikatan space rata short dash rata comma space maka  increment straight H equals sum increment straight H subscript reaktan space – space sum increment straight H subscript produk  space space space space space space equals left parenthesis left parenthesis 6 left parenthesis straight C – straight H right parenthesis plus left parenthesis straight C – straight C right parenthesis plus left parenthesis Cl – Cl right parenthesis right parenthesis – left parenthesis left parenthesis 5 left parenthesis straight C – straight H right parenthesis plus left parenthesis left parenthesis straight C – straight C right parenthesis plus left parenthesis straight C – Cl right parenthesis plus left parenthesis straight H – Cl right parenthesis right parenthesis  space space space space space space equals left parenthesis straight C space – space straight H right parenthesis space plus space left parenthesis Cl space – space Cl right parenthesis space – space left parenthesis straight C space – space Cl right parenthesis space – space space left parenthesis straight H space – space Cl right parenthesis  space space space space space space equals space 410 space plus space 243 space – space 330 space – space 432 space  space space space space space space equals short dash 109 space kJ divided by mol end style

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Gas etana dapat terbentuk melalui raeksi antara gas etuna dan gas hidrogen. Jika diketahui energi ikatan rata-rata C≡C, C-H, C=C, C-C dan H-H berturut-turut 845, 416, 613, 342 dan 432 kJ/mol maka n...

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