Find the dihedral angle between `H'` and `H''` in given structure

What is the dihedral angle between two H atoms of H_(2)O_(2) in gaseous state?

In gaseous hydrogen peroxide, the dihedral angle between H-atom is x^(@) but in solid state it is y^(@) . The values of x and y are respectively

The bond angle between H - O - H atoms.

In the eclipsed conformation of ethane , the dihedral angle between the gydrogen atoms of adjacent methyl groups is

What is the dihedral angle between two H atoms of H_(2)O_(2) ?

The dihedral angle in gaseous H_(2)O_(2) is

The dihedral angle in gaseous H_(2)O_(2) is