In the reaction BH₃ + NH₃→H₃B - NH₃ the H - B - H bond angles change from about:

Question

Quizplus · Accepted Answer

Based on the reactants and products given in the chemical equation, we can see that the H₃ molecule is going from being bonded to one H atom and one NH₃ molecule to being bonded to one B-NH₃ molecule. The H-B-N bond angle in NH3 is 107.5 degrees, and the N-H-B bond angle in NH2- is 102 degrees. Since the H₃ molecule is going from being bonded to an H and an N (with bond angles of about 107.5 and 102 degrees, respectively) to being bonded to an N and a B (with bond angles of about 109 degrees each), we can infer that the H-B-H bond angle is changing from about 120 degrees in the reactants to about 109 degrees in the product. Therefore, the best choice is C.

In the Reaction BH3 + NH3→H3B - NH3 the H

In the Reaction BH₃ + NH₃→H₃B - NH₃ the H