2 moles of a compound are allowed to react ina foam coffee cup that contains 197

Question

2 moles of a compound are allowed to react ina foam coffee cup that contains 197 grams of water. Thereaction caused the temperature of the water to rise from 21 to24.7 degrees Celsius. What is the enthalpy of this reaction? Assumethat no heat is lost to the surrounding or to the coffee cupitself. Enter your answer in kilojoules permole of compound


2 moles of a compound are allowed to react ina foam coffee cup that contains 197 grams of water. Thereaction caused the temperature of the water to rise from 21 to24.7 degrees Celsius. What is the enthalpy of this reaction? Assumethat no heat is lost to the surrounding or to the coffee cupitself. Enter your answer in kilojoules permole of compound

Explanation / Answer

      Specific heat ofwater= S = 4.186 J / gram oC       T = 24.7 - 21 =3.7oC      mass = m = 197 g              q solution = mST                                  = 197 * 4.186 *3.7                                   = 3051.1 J                                   = 3.0511 kJ   for two moles of compound             for one mole q solution = (3.0511 / 2) = 1.525 kJ/ mol                Enthalpy of reaction Hrxn = - qsolution                                                           = - 1.525 kJ /mol                                                           = - 1.525 kJ /mol   

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