if it takes approximately ,1 erg of energy for a fly to lift off from a table top.how many flies could get air borne by avogadro`s number of photon of yellow sodium (Na) light of wavelength=5800 angstorm?

'x' gm of a compound A3B2C5 contains 'y' gm of A atoms

 

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how to represent the possible fischer projections for 2-bromohexane