The element in period 4 of the Periodic Table with the highest electronegativity is krypton (2.96).
The weight/weight percent(%w/w) of NaCl in solution : 33.03%
<h3>Further explanation</h3>
Given
Mole fraction of NaCl : 0.132
Required
The weight/weight percent of NaCl
Solution
1 mol solution : 0.132 mol NaCl + 0.868 mol H₂O
mass NaCl :

mass H₂O :

Total mass = 7.714 + 15.64 = 23.354 g

Answer:
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I think it’s most likely Water vapor