74. Solving a chemistry problem

74. Solving a chemistry problem

2. Calculate the work of adhesion Wa for liquid A, wetting the surface of the PTFE, if the surface tension σ and the wetting angle O are known (see Table 1).
Table 1
Surface tension and contact angle values

Option 1 2 3 4 5 6 7 8 9 10
σ*103,
J/mol
72.0
72.5
72.7
63.0
63.3
63.5
29.3
29.5
29.7
475
О 108 109 110 99 100 101 43 44 45 130

For variants 1, 2, and 3, liquid A is water. For 4, 5 and 6 options - glycerin. For 7, 8 and 9 options - benzene. For option 10, the liquid is mercury.

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