Bond energy values O=O, H-F, and O-H are 495,564,452kj/mol . Calculate the bond energy for O-F from the following Reaction

OF2+H2O-----------O2+2HF , delta H=-318kj

'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