why does the yield in sandmayer reaction is more than gatterman reaction for preparation of haloarenes although in the later we use Cu powder which has large surface area?

'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