Chemistry: Calculate the change in enthalpy?

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zhen

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Calculate the change in enthalpy when ammonium nitrate decomposes and show whether it is endothermic or exothermic.
NH4 NO3 -->
N2 +2H2 O
given H NH4 NO3 = -87.4 kcal/mole
N2 O = 19.5
H2 O = -57.8
 
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