Use the standard enthalpies of formation from Appendix G to calculate the enthalpy change for each of the following reactions at 298.15 K and 1 atm. Label each as endothermic or exothermic.

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(a) NaHCO3(s) → NaOH(s) + CO₂(g) (b) H₂O(l) + SO3(g) →H₂SO4(0) (c) H₂O(g) + SO3(g) → H₂SO4(l)