2.6 g of an element X is reacted with an...

2.6 g of an element X is reacted with an aqueous solution containing NaOH and `NaNO_(3)` to yield `Na_(2)XO_(2) " and "NH_(3)` .`NH_(3)` thus liberated is absorbed in 100mL of 0.11 M `H_(2)SO_(4)` . The excess acid required 48 mL of 0.25 M NaOH for complete neutralisation. Find the atomic weight of X.

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