How much is a mole

If a mole is 6.02 x 10 items, how far will a mole of paper clips, placed end to end lengthwise, reach into space  

How many light-years (ly) would the paper clips extend into space  

A pair is always two objects, a dozen is 12, a gross is 144, and a ream is 500. Can you think of any other counting units  

The amount of each substance shown is 6.02 X 10 or one mole of representative particles. The representative particle for each substance is shown in a box. Refer to Table C-1 In Appendix C for a key to atom color conventions. 

Chemists also need a convenient method for counting accurately the number of atoms, molecules, or formula units in a sample of a substance. As you know, atoms and molecules are extremely small. There are so many of them in even the smallest sample that it s impossible to actually count them. That s why chemists created their own counting unit called the mole. In the DISCOVERY LAB, you found that a mole of paper clips is an enormous number of items. 

Counting large numbers of items is easier when you use counting units such as decades or dozens. Chemists use a counting unit called the mole. 

Select an item to measure, such as a paper clip, gum drop, or marshmallow, from the choices provided by your teacher. 

Use a ruler to measure the length of your item to the nearest 0.1 cm. 

Compare the distance you calculated in Question 2 with these astronomical distances  

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How much is a mole Why is Avogadro s number used when counting atoms but not in counting everyday amounts ... 

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