You started with enough N204 to make 80.0 grams of NO2 but you only made 50.0 grams. What is your percent yield (in %)?

The bond polarity does each bond in a BH3 molecular is polar, due to the difference in electronegative of the B and H atom. The molecular shale is Tritons planar, and the molecular is non-polar - because due to the symmetry of the molecule, the polarities cancel out.