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To find the number of moles of MgS₂O₃ in 209 grams, you first need to calculate the molar mass of MgS₂O₃. The molar mass is approximately 120.37 g/mol (Mg: 24.31 g/mol, S: 32.07 g/mol x 2, O: 16.00 g/mol x 3). Then, divide the mass of the compound by its molar mass: ( \text{moles} = \frac{209 \text{ g}}{120.37 \text{ g/mol}} \approx 1.74 ) moles.

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