Chemistry Equation Question: pls show your consequences?

The element X has a relative atomic mass of 35.5. X₂ reacts with a sodium salt of Y according to the equation:
2NaY + X₂ --› Y₂ + 2NaX
If 14.2g of X₂ is used and 50.8g of Y₂ is formed, what is the relative atomic mass of Y?
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