J.R. S. answered 02/26/18
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Molar mass methyl salicylate = 152 g/mole
moles methyl salicylate present = 2.7 g x 1 mole/152 g = 0.0178 moles
Assuming complete conversion to salicylic acid (which would require acid like H2SO4 in addition to NaOH), then ...
Theoretical yield of salicylic acid = 0.0178 moles methyl salicylate x 1 mole salicylic acid/mole methyl sal = 0.0178 moles salicylic acid x 138 g/mole = 2.45 g of salicylic acid