Please help me in solving this easy problem

2.6 g of an element X is reacted with an aqueous solution containing NaOH and NaNO3 to yield Na2XO2 and NH3. NH3 thus liberated is absorbed in 100 mL of 0.11 M H2SO4. The excess acid required
48 mL of 0.25M NaOH for complete neutralisation. Atomic weight of X is :

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