What is surface tension and an example of surface tension

Surface tension is a film made by water and it's polar characteristic. Since water is polar, it tends to stick together. When something tries to break the surface of water, surface tension comes into play. Simply, surface tension is a sort of film that tries to prevent things from breaking the water's surface. An example would be water on a penny that domes instead of breaking or going flat.

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answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.