1/ How many atoms are present in a 75.0 âcm3 sample of plumber's solder, a leadâtin alloy containing 67% Pb by mass and having a density of 9.4 g/cm3?

Express your answer using two significant figures.

2/ How many Cu atoms are present in a piece of sterlingsilver jewelry weighing 33.74 g ? (Sterling silver is a silverâcopper alloy containing 92.5% Ag by mass.)

Express your answer using two significant figures.

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8 Mar 2023

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