A total of 2.00 m o l of a compound is allowed to react with water in a foam cof
ID: 798220 • Letter: A
Question
A total of 2.00 mol of a compound is allowed to react with water in a foam coffee cup and the reaction produces 112g 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.
Delta H = ??? kJ/mol
A total of 2.00 mol of a compound is allowed to react with water in a foam coffee cup and the reaction produces 112g 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.
Delta H = ??? kJ/mol
Explanation / Answer
Heat = (mass of water) x (change in Temp) x (specific heat of water)
The specific heat of water is 4.184 joules per gram per degree Celsius
Heat = (mass of water) x (change in Temp) x (4.184 J g^-1 oC^-1)
Heat = (112)(3.7)(4.184) = 1733.84 J
The enthalpy of the reaction would have a negative sign because heat is being released by the reaction.
Enthalpy (in units of kJ/mol) = - 1.733 kJ / 2 mol = - 0.8669 kJ/mol
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