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How many neutrons are found in a 5.0 pmol sample of 90Zr ? (Do this type of problem on paper without a calculator. Take it

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How many neutrons are found in a 5.0 pmol sample of 90Zr ? (Do this type of problem on paper without a calculator. Take it step by step using dimensional analysis. Make appropriate approximations where necessary to choose the logical answer from the choices below.)

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