Sapling Learning Mapdd A coffee cup calorimeter was used to measure the heat of

Question

Sapling Learning Mapdd A coffee cup calorimeter was used to measure the heat of solution the change in enthalpy that occurs when a solid dissolves in water. A 10.0 g sample of an ionic compound with a molar mass of 185.0 g/mol was added to a sample of deionized water to produce 60.0 grams of solution. After stirring and dissolving the solid, the temperature was found to change from 25.00 °C to 23.79 °C. Calculate the enthalpy of solution, dHsolution, per mole of salt dissolved. Assume the specific heat of the solution is 4.10 J(g C) and the heat capacity of the calorimeter is 4.50 Jrc Number Calculate the heat change experienced by the calorimeter contents, qcontents Number Calculate the heat change experienced by the calorimeter, qcal Calculate the heat change produced by the solution process, qsol Number Calculate AHsalution, the enthalpy of solution for Number one mole of solid in kJ/mol. k.J/ mol Previous e Check Answer Next ?? Exit Hint

Explanation / Answer

1)

q = m Cp dT

   = - 60 x 4.10 x (25 - 23.79)

q = - 297.66

q = - 298 J

2)

q = 4.50 x - (25 - 23.79)

q = - 5.44 J

3)

q = 5.44 + 297.66

q = - 303 J

4)

n = 10 / 185 = 0.05405

delta H = - Q / n = 0.303 / 0.05405

delta H = 5.61 kJ/mol

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