(Polar molecules, Non-polar molecules, etc.)
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For part d of the question where it asks for the Lewis structure and bond angle N2H4, the book gives the exact bond angle of 107. I know in class Dr. Lavelle said for trigonal pyramidal structures we only have to know that the angle is less than 109.5, so for our answer would it be okay to say less than 109.5 and not give the exact angle even though that is what the book says?
I think it would be good to know the exact angles of the trigonal pyramidal structure. However, saying less than 109.5 should probably suffice if you don't know it since Lavelle already said we don't need to know the specific value.
Test questions, unless given experimental data to permit exact bond angles, will generally accept "less than 109.5" because, without an experiment, one can't really know the extent to which the lone pairs can alter the position of the bonded atoms because there isn't a calculation to tell us that.
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