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To determine the gram of sodium we have to first of all write the chemical reaction of sodium with sulfur.
From the reaction 2 mole of sodium react with 1 mole of sulfur.
Now,weight of sulfur=16.5 g
Mole of sulfur=weight/Atomic weight =16.5/32=.515625 mole
So mole of sodium =2*.515625=1.03125
Weight of sodium =mole*atomic weight =1.03125*23 =23.7 g(answer-option D)
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