Upon the decomposition of baking soda, carbon dioxide is release, which causes a cake to rise while baking. The reaction is as follows: 2 NaHCO3 (s) ---> H2O (l) + CO2 (g)  Enthalpy change = 129 kJ Question #1 - Calculate the kilojoules or heat required to decompose 2.5 mol NaHCO3 ? A. -125 kJ B. 125 kJ C. -155 kJ D. 155 kJ Question #2 - Determine the enthalpy of the reaction.  A. Exothermic B. Endothermic C. Cannot be determined D. either A or B

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