Data from the Bureau of Standards (J. Phys. Chem. Ref. Data, vol. 11, suppl. 2, 1982) include the following heats of formation for 1 mol of C_aCl₂ in water at 25°C:

From these data prepare a plot of Δ̃H̃, the heat of solution at 25°C of C_aCl₂ in water, vs. ñ, the mole ratio of water to C_aCl₂.

Transcribed Image Text:

CaCl2 in 10 mol H20 -862.74 kJ CaCl2 in 15 mol H,0 CaCl, in 20 mol H20 CaCl2 in 25 mol H,0 CaCl, in 50 mol H20 CaClz in 100 mol H2O CaCl, in 300 mol H20 CaClz in 500 mol H2O CaCl2 in 1000 mol H20 -867.85 kJ -870.06 kJ -871.07 kJ -872.91 kJ -873.82 kJ -874.79 kJ -875.13 kJ -875.54 kJ