Use the values of bond enthaipies given in Section 11 of the IB Chemistry data booklet. 1. All hydrocarbons burn according to the following equation (the state of the hydrocarbon, C. H., at standard
conditions varies according to its mass and structure):
C. H, + (x + 4y)O(g) 4XCO(g) + 2yHẠO(1)
Explain, in terms of bond enthalpies, why the combustion of all hydrocarbons is exothermic.

answer : (a) volume of the gas = 8.67 ×   l

                (b) second virial coefficient b = -1.21226 l/mole

solution :   given,     t = 300k

                                p = 20atm

                                z = 0.86

                                n = 8.2 mmoles = 8.2 × moles

                                r =   0.082 l atm/k/mol

        find,     (a) volume of gas   and (b) second virial coefficient b at 300k.

formula used :            

                          and            

(a)            

                    = \times 0.082\times 300}{20}[/tex]

                    = 8.67 ×   l

(b)      

                    = (0.00867-1) × 8.659

                    = - 8.5839 l/mole

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