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me File Edit View History Bookmarks Pegi 2 https://session.masteringchemistry.com/myct/itemView?offset-next&assignmentProblemID; 72145123 Intro Chem 1405/06-73 Week 6 &7 Post Lecture Homework Problem 4.109 previous l 3 of 31 Problem 4.109 se C Part A A lead atom has a mass of 3.4 x 10-2g. How many lead atoms are in a cube of lead that has a volume of 2.50 cm3 ifthe density of lead is 11.3 g/em Express your answer using two significant figures atoms of Pb Submit My Answers Give Up Provide Feedback Continu

Explanation / Answer

Convert volume of lead cube into mass

mass = density x volume

mass of lead cube = 2.5 cm3 x 11.3 g/cm3 ( cm3 cancel out)

mass of lead cube = 28.25 g

mass of one lead atom = 3.4 x 10-22 g

Therefore number of lead atom in cube = 28.25 g / 3.4 x 10-22 g

= 8.3 x 1022 atoms are present in the cube

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