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When a solid dissolves in water, heat may be evolved or absorbed. The heat of dissolution...

When a solid dissolves in water, heat may be evolved or absorbed. The heat of dissolution (dissolving) can be determined using a coffee cup calorimeter.

In the laboratory a general chemistry student finds that when 2.06 g of CaCl2(s) are dissolved in 112.20 g of water, the temperature of the solution increases from 23.13 to 26.44 °C.

The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.84 J/°C.

Based on the student's observation, calculate the enthalpy of dissolution of CaCl2(s) in kJ/mol.

Assume the specific heat of the solution is equal to the specific heat of water.

ΔHdissolution =  kJ/mol

Solutions

Expert Solution

Water                                              calorimeter

m = 112.2g                                  c   =1.84J/0C

c   = 4.184J/g-0C             

q = q H2O + q calorimeter

   = 112.2*4.184*(26.44-23.13) + 1.84*(26.44-23.13)

   =   1553 .86 + 6.0904

           = -1559.95J    =- 1.55995KJ

no of moles of CaCl2   = W/G.M.Wt

                                     = 2.06/111   = 0.0185moles

H dissolution    = -1.55995KJ/0.0185moles   = -84.32KJ/mole

queen_honey_blossom answered 2 years ago
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