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Acetylene gas (ethyne; HC = CH) burns in an oxyacetylene torch to produce carbon dioxide and water vapor. The heat of reaction for the combustion of acetylene is 1259 kJ/mol.
(a) Calculatethe C = C bond energy, and compare your value with that in Table 9.2, p.371.

Respuesta :

tanisharawat014

The bond energy of C≡C is 799.5kj/mol .

Given ,

Acetylene gas (ethyne; HC≡CH) burns in an oxyacetylene torch to produce carbon dioxide and water vapor .

The  combustion reaction of acetylene is given by ,

HC≡CH + 5/2 O=O →2CO2 + H2O

Heat of reaction for the combustion of acetylene = 1259kj/mol

Now ,

∆H (HC≡CH)

= 2×BE(C-H) + BE(C≡C) + 5/2×BE(O=O) -4BE(C=O) -2BE(O-H)

-1259kj/mol=2××413kj/mol+ BE(C≡C) +5/2×495kj/mol -4×799kj/mol-2×463kj/mol

-1259kj/mol =826kj/mol +BE(C≡C) +1237.5kj/mol - 3196kj/mol- 926kj/mol

BE(C≡C) =799.5kj/mol

Hence , the bond energy of C≡C is799.5kj/mol .

Learn more about acetylene here:

brainly.com/question/15346128

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