According to vsepr theory, the bond angle in h2se would be predicted to be:

The bond angle in H2Se would be predicted should be less than 109.5 degrees. Particle shapes can be anticipated in light of Lewis dab structure utilizing the VSEPR hypothesis. VSEPR remains for Valence Shell Electron Pair Repulsion. It expresses that electron matches in the valence shell of a particle repulse each other; their sub-atomic geometry is the consequence of this shock.

109.5°

Explanation:

According to vsepr theory, the bond angle is affected by many factors. Some of these factors are the presence of the lone pairs of electrons. Some, are simply the size of the electron cloud of the atom. The molecule  H₂Se is synonymous with the water molecule,H₂O. Water has two LONE PAIRS of electrons on the oxygen atom. This increases the repulsion of the electron clouds giving the molecule a V-shape of 109.5°. Thus, H₂Se has and angle of 109.5° as water molecule

To determine the number of moles of HCl from 2 moles of H2, we take stoichiometry to solve this problem. The balanced equation is 2HCl= H2+Cl2 Using stoichiometry, the expression becomes 2 mole H2*(2 molHCl/1 mole H2). The answer is 4 moles.