Sodium carbonate, NA2CO3, is used to manufacture glass. It is obtained from sodium hydrogen carbonate, NaHCO3, by heating.
2NaHCO3(s) †’ NA2CO3(s) + H2O(g) + CO2(g)
Calculate the standard enthalpy of reaction, using enthalpies of formation (Table 6.2).

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TABLE 6.2 Standard Enthalpies of Formation (at 25) Substance or lon Substance or on Substance or lon CaCOa(s, calcite) 1.897 7 2 S(s, monoclinic) 0360 7 5 NH (ag HCHOg)