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What is dihedral angle in describing the...

What is dihedral angle in describing the structure of `H_(2)O_(2)` ? How it changes with a change in physical state ?

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Dihedral angle is the angle between two pages of the open book structure of hydrogen peroxide. The dihedral angle in gas phase of hydrogen peroxide is `11^(0)30.` and in solid state is `90^(0)15.`. This decrease in the dihedral angle is attributed to hydrogen bonding.
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