A sodium hydroxide solution containing 40% by weight of pure NaOH has a specific gravity of 1.5. What volume of this solution will be required in the preparation of 500ml of a 0.045M NaOH solution

'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