Answer:
To get the number of atoms in this sample, we first need the number of moles of lead in 11.3 grams
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<u>Number of moles of Lead:</u>
Molar mass of lead = 207 grams / mol
Number of moles = given mass / molar mass
Number of moles = 11.3 / 207
Number of moles = 0.05 moles
<u>Number of atoms of lead in 11.3 gram sample:</u>
Number of atoms = Number of moles * avogadro's number
Number of atoms = 0.05 * 6.022 * 10²³
Number of atoms = 5 * 10⁻² * 10²³ * 6.022
Number of atoms = 30.11 * 10²¹