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a) $C_3H_5O_9N_3(l) \rightarrow 3\ CO_2(g)+5/2\ H_2O(g)+3/2\ N_2(g)+1/2\ O_2(g)$ b) $-6.23\ kJ/g\times 227.09\ g/mol=-1414.8\ kJ/mol$
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