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Water molecule can be visualized as anisosceles triangle with an oxygen ion (-3.2E-19 C) and two Hydrogenions (1.6E-19 C each) at the three corners. The two short sides are equal in length and they are called OH bonds (0.11nm length). The two OH bonds form an angle of about 109degrees.

Find the potential energy.
Find the external energy required to compress the OH bond by10%.

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