The bond angles marked a, b, and c in the molecule below are about , , and , respectively. Select correct answer. Select correct answer. 120°, 109.5°, 120° 90°, 90°, 90° 109.5°, 120, 109.5° 109.5°, 109.5°, 109.5° 109.5°, 109.5°, 90°

109.5°, 120°, 109.5°

Explanation:

The bond angles that are marked as a, b and c in the given molecules is in the order of :

Angle a : 109.5°

Nitrogen is hybridized and the geometry is tetrahedral. So the bond angle is 109.5°

Angle b : 120°

Carbon is hybridized, so the shape is trigonal planer and the bond angle is 120°

Angle c : 109.5°

Carbon is hybridized and the geometry is tetrahedral. The bond angle is 109.5°

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.