Chemistry question. Please help! Dicyanoacetylene (C_4N_2) is an exotic fuel tha

Question

Chemistry question. Please help! Dicyanoacetylene (C_4N_2) is an exotic fuel that produces one of the hottest flames of any known chemical when combusted with pure oxygen according to the following balanced equation: What is S degree of C_4N_2 (1) given that for O_2(g), CO_2(g) and NO_2(g), S degree are +205, +214 and +240 J/mole K, respectively? Estimate the heat of formation of dicyanoacetylene given the following: Under standard conditions of pressure, at what temperatures is the reaction spontaneous? At what temperatures is the reaction non-spontaneous?

Explanation / Answer

So for C4N2

So reaction = So for products - So for reactants

+34 = 4(214) + 2(240) - ((6(205) + So for C4N)

34 = 106 - So for C4N

So for C4N2 = 106 - 34 = 72 j/mole K

heat of formation of C4N2 = Hof co2 + Hof No2

                                 Hof C4N2 = -394 + 33.2 = - 360.2 Kj/mole

G = H - S T

         - 360200 - 72( T ) = 0

T = 5002.7 K

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