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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 together 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 Δ,H° for this reaction. 2A1(s) + 2 NH4Clo,(s) Al2O3(s) + N2(g) + → 3H2O(g) + 2HCl(g) +O2(g) -295.3 -1675.7 0 -241.8 -92.3 0 kJ-mol-1
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