Emulsification of 10 ml of oil in water produces 2.4 x 101 8 droplets. If the surface tension at the oil-water interface is 0.03 Jm-2x ​​ and the area of each droplet is 12.5 x 10-16 m2, the energy spent in the formation of oil droplets is :
A) 90 J
B) 30 J
C) 900 J
D) 10 J

Dear student,
 
Energy spent in the formation of oil droplets can also be termed as Surface energy. So here we have to calculate surface energy for the formation of  2.4 x 1018 droplets.
Relation between surface tension and surface energy is -
E = T . S , where, E = surface energy, T = surface tension and S = total surface area.
E = 0.03 Jm​-2 X (2.4 x 1018 x 12.5 x 10-16)m2
E = 90 J

Regards
 

  • 2
sorry there is Jm​-2 only
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