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.

ΔH_dissolution = 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 1 year ago

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