To a very crude approximation, a water molecule consists of a negatively charged

Question

To a very crude approximation, a water molecule consists of a negatively charged oxygen atom and two "bare" protons, as shown in the figure(the figure shows a water molecule bonds 1X10^-10m and angle is 105 degrees).Calculate the electrostatic energy of this configuration, which is therefore the magnitude of the energy released in forming this molecule from widely separated atoms. Note: Your answer is an overestimate because electrons are actually "shared" among the three atoms, spending more time near the oxygen.

Explanation / Answer

U=W=Kqiqj

a=10-10m

the hydrogen-hydrogen pair has separation

=2acos37.5=1.59a

U=2K(e)(-2e)=a+ke2=1.59a=-3.37(9*109)(1.6*10-19)=10-10

=48.5ev

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