Question
In: Chemistry
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 agoRelated Solutions
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