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The given number of molecules is half of Avogadro's Number, which is defined as the number of molecules in one mole. Therefore, the given number of molecules is one-half of a mole. More exactly, 3.01/6.022 = 0.4998, but since the given number of significant digits is three in 3.01, this value rounds to 0.500. Therefore, the answer can be expressed as 0.500 moles.

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