How many copper atoms are in a copper penny with a mass of 3.10 g? (Assume that the penny is composed of pure copper.)

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SORT You are given the mass of copper and asked to find the number of copper atoms. STRATEGIZE Convert between the mass of an element in grams and the number of atoms of the element by first converting to moles (using the molar mass of the ele- ment) and then to number of atoms (using Avogadro's number). GIVEN: 3.10 g Cu FIND: Cu atoms CONCEPTUAL PLAN g Cu 1 mol Cu 63.55 g Cu mol Cu number of Cu atoms 6.022 x 1023 Cu atoms 1 mol Cu RELATIONSHIPS USED 63.55 g Cu = 1 mol Cu (molar mass of copper) 6.022 x 1023 1 mol (Avogadro's number)