Why is nhcoch3 op-directing?(I am aware that an answer already exist in this site. I am asking this again as the resonance diagram given is not clear to me.So please include another diagram in the answer)

'x' gm of a compound A3B2C5 contains 'y' gm of A atoms Using above informationMatch the following

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how to represent the possible fischer projections for 2-bromohexane

Calculate the water crystallization percentage for sodium carbonate decahydrate