Lead is a heavy metal that remains in the bloodstream,...

Lead is a heavy metal that remains in the bloodstream, causing mental retardation in children. It is believed that $3 \times 10^{-7} \mathrm{~g}$ of Pb in 1.00 mL of blood is a health hazard. For this amount of lead (a) how many atoms of lead are there in one mL of a child's blood? (b) how many moles of lead are in 1.00 L of blood?

Lead is a heavy metal that remains in the bloodstream, causing mental retardation in children. It is believed that $3 \times 10^{-7} \mathrm{~g}$ of Pb in 1.00 mL of blood is a health hazard. For this amount of lead
(a) how many atoms of lead are there in one mL of a child's blood?
(b) how many moles of lead are in 1.00 L of blood?

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Key Concepts

Atomic Mass

Atomic mass is the mass of one mole of an element, expressed in grams per mole. It is critical in stoichiometric calculations as it allows you to convert a measured mass of an element into the number of moles, which is a bridge between the macroscopic and atomic scales. For lead, this conversion uses its specific atomic mass.

Mass-to-Mole Conversion

The mass-to-mole conversion is a fundamental concept in chemistry where the mass of a substance is divided by its molar mass to determine the number of moles present. This conversion is essential for quantifying the amount of a substance in chemical reactions or concentration calculations.

Avogadro's Number

Avogadro's Number, approximately 6.022 x 10^23, is the number of atoms or molecules in one mole of a substance. It is used to translate the number of moles of a substance into the actual number of individual atoms or molecules, which is crucial in problems that require determination of atomic counts based on given mass.

Volume Conversion

Volume conversion involves changing units of volume, for example converting milliliters to liters. This is important when dealing with concentrations in solution, as it ensures that the amount of a substance is correctly scaled to the appropriate volume, enabling accurate calculations of moles per liter.

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