or 13 Part A A total of 2.00 mol of a compound is allowed to react with water in

Question

or 13 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 197 g of solution. The reaction caused the temperature of the solution to rise from 21.00 to 24.70 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. View Available Hintfs) ? ??? kJ/mol Submit Provide Feedback t >

Explanation / Answer

we have

mass of solution = 197 g

s = 4.18 J/g-C

dT = 24.7 - 21.0 = 3.70 C

thus

heat = m * s * dT = 197 g x 4.18 J/g-C x 3.70 C = 3046.80 J

and

enthapy of reaction = heat / moles of compound = 3046.80 J / 2 mole = 1523.40 J/mol = 1.52 kJ/mol

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