The bond order of BF₄⁻ is 1 and the bond order of BF₃ is 1.33
So, BF₃ is having more bond order than BF₄⁻.
In other words, BF₃ > BF₄⁻ ( You can write Bond Order or in B.O it's the abbreviation of Bond Order ).
The problem ask to calculate the density of the solid if it has a mass of 9.35g and is place in a 15ml flask. Base on my calculation and further formulation about the density of the two, by subtracting the density of the Benzene, the solid has a density of 1.59g/ml. I hope this would help
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answer my Question please
