2. The launch of the Space Shuttle was assisted by solid propellant rockets cont

Question

2. The launch of the Space Shuttle was assisted by solid propellant rockets containing aluminum as the fuel and ammonium perchlorate, NH4CIO4, as the oxidizer; the two powders were bound togther by a rubbery polybutadiene binder. Neglecting the binder (which is also a fuel) a balanced reaction equation is shown below. Use the listed values of the formation enthalpies to calculate ,l1° for this reaction. 3H2O(g) -241.8 2 Al(s) + 2 NH4CIO4(s) Al2O3(s) N2(g) 2HCl(g) +02(2) + + + -295.3 -1675.7 0 -92.3o kJ-mol-1

Explanation / Answer

we have the Balanced chemical equation as:

2 Al(s) + 2 NH4ClO4(s) ---> Al2O3(s) + N2(g) + 3 H2O (g) + 2 HCl (g) + O2 (g)

deltaHo rxn = Hof(Al2O3(s)) + Hof(N2(g)) + 2*Hof(HCl(g)) + Hof(O2(g)) - 1*Hof(Al(s)) - 1*Hof(NH4ClO4(s))

deltaHo rxn = (-1675.7) + 0 +3*(-241.8) + 2*(-92.3) + 0 -2*0 - 2*(-295.3)

= -1995.1 KJ

Answer:  -1995.1 KJ

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