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Sucrose has a molecular weight of 342.299 gm. So 0.20 moles would be 68.4598 gm. Since you only have 0.5 L, you would need half this amount, which would be 34.2299 gm.
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What mass of sucrose, C12H22O11, is needed to make 500 mL of 0.20M solution?
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