Part A A total of 2.00 m o l of a compound is allowed to react with water in a f

Question

Part A A total of 2.00 mol of a compound is allowed to react with water in a foam coffee cup and the reaction produces 157g of solution. The reaction caused the temperature of the solution to rise from 21.0 to 24.7?C. What is the enthalpy of this reaction? Assume that no heat is lost to the surroundings or to the coffee cup itself and that the specific heat of the solution is the same as that of pure water. Enter your answer in kilojoules per mole of compound to three significant figures. Part A A total of 2.00 mol of a compound is allowed to react with water in a foam coffee cup and the reaction produces 157g of solution. The reaction caused the temperature of the solution to rise from 21.0 to 24.7?C. What is the enthalpy of this reaction? Assume that no heat is lost to the surroundings or to the coffee cup itself and that the specific heat of the solution is the same as that of pure water. Enter your answer in kilojoules per mole of compound to three significant figures.

Explanation / Answer

Heat released by reaction = heat absorbed by solution

= mass x specific heat x temperature change of solution

= 157 x 4.184 x (24.7 - 21.0)

= 2430.5 J


Delta H = -heat released/moles of compound

= -2430.5/2.00

= -1215 J/mol = -1.22 kJ/mol

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