How many moles are in 1.204 x 1024 lithium atoms?
Answers
Explanation:
Mole Concept Suppose you want to carry out a reaction that requires combining one atom of iron 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 of atoms. Besides, the merest speck (0.001 g) of iron contains over a billion billion atoms. The same is true of sulfur. Fortunately, you do have a way to relate mass and numbers of atoms. One iron atom has a mass of 55.847 amu, and 55.847 g of iron contains 6.022 137 atoms of iron. Likewise, 32.066 g of sulfur contains 6.022 137 1023 1023 atoms of sulfur. Knowing this, you can measure out 55.847 g of iron and 32.066 g of sulfur and be pretty certain that you have the same number of atoms of each. The number 6.022 137 it is rounded off to 6.022 1023 is called Avogadro’s number. For most purposes 1023. Because this is an awkward number to write over and over again, chemists refer to it as a mole (abbreviated mol). 6.022 1023 objects is called a mole, just as you call 12 objects a dozen. Look again at how these quantities are related. 55.847 g of iron 32.066 g of sulfur 6.022 6.022 1023 iron atoms 1023 sulfur atoms 1 mol of iron 1 mol of sulfur General Plan for Converting Mass, Amount, and Numbers of Particles 1 Mass of substance Convert using the molar mass of the substance. 2 Amount of substance in moles Use Avogadro's number for conversion. Copyright © by Holt, Rinehart and Winston. All rights reserved. 3 Number of atoms, molecules, or formula units of substance