Transcription of Skills Worksheet Problem Solving
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Skills Worksheet Problem Solving
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.
Is the number of significant figures correct? Yes; the number of significant figures is correct because there are four signifi-cant figures in the given value of 388.2 g Fe. Is the answer reasonable? Yes; 388.2 g Fe is about seven times the molar mass. Therefore, the sample contains about 7 mol. Practice 1.
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