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 The modern atomic weight scale is based on

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Important Questions on Some Basic Concepts of Chemistry

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Atoms have a mass of the order __________
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One mole of CO2 contains ____________
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In a chemical scale, the relative mass of the isotopic mixture of oxygen atoms (16O, 17O, 18O) is assumed to be equal to__________ 
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The mass of 1 atom of hydrogen is ______.
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Let the molar mass of an element be A grams. Then, the mass of 10 atoms of the element in amu is
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The average mass of one gold atom in a sample of naturally occurring gold is 3.257×10-22 g. Use this to calculate the molar mass of gold.
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Which property of an element may have non-integral value?
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The weight of one atom of Uranium is 238 amu. Its actual weight is_____g.