At 25 ^$\circ$ C, the Standard Enthalpy of Formation of Anhydrous Sodium Carbonate

question 52

Multiple Choice

At 25 ^$\circ$ C, the standard enthalpy of formation of anhydrous sodium carbonate is -1130.9 kJ/mol, whereas the standard enthalpy of formation of sodium carbonate monohydrate is -1430.1 kJ/mol. Determine $\Delta$ H ^$\circ$ at 25 ^$\circ$ C for the reaction Na₂CO₃(s) + H₂O(l) $\rarr$ Na₂CO₃·H₂O(s) .(Given: $\Delta$ H ^$\circ$ _f[H₂O(l) ] = -285.8 kJ/mol)

• A) -585.0 kJ/mol
• B) -156.3 kJ/mol
• C) -299.2 kJ/mol
• D) -13.4 kJ/mol
• E) -285.8 kJ/mol

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