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Skills Worksheet Problem Solving - School of Arts & Sciences

Copyright by Holt, Rinehart and Winston. All rights ChemFile: Problem - Solving Workbook48 Mole ConceptMole ConceptSuppose you want to carry out a reaction that requires combining one atom ofiron with one atom of sulfur. How much iron should you use? How much sulfur?When you look around the lab, there is no device that can count numbers ofatoms. Besides, the merest speck ( g) of iron contains over a billion billionatoms. The same is true of , you do have a way to relate mass and numbers of atoms. One ironatom has a mass of amu, and g of iron contains 137 1023atoms of iron. Likewise, g of sulfur contains 137 1023atoms of sul-fur. Knowing this, you can measure out g of iron and g of sulfur andbe pretty certain that you have the same number of atoms of each.

In Sample Problem 3, you were asked to determine the number of moles in 1.204 1024 atoms of lithium. Had you been given the amount in moles and asked to calculate the number of atoms, you would have simply multiplied by Avogadro’s number. Steps 2 and 3 of the plan for solving Sample Problem 3 would

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