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-When we encounter objects, we like to group them together in a convenient amount
-Lets weigh 1 dozen of different items
-1 dozen navy beans=10 grams
-1 dozen glass gems=198 grams
-1 dozen bouncy balls=150 grams
-1 dozen metal shots=20 grams
Mole Concept
-For element: A mole is the atomic weight using grams instead of atomic mass
1 mole= Atomic weight g/mole
-for compound: A mole is the formula (or molecular) weight in grams instead of atomic mass unit.
1mole=FM in grams
One MOLE of anything has 602,200,000,000,000,000,000 items
1mole-6.02x10^23 atoms/molecular
-Relates the mass of a sample of an element to the number of atoms within it so that the number of atoms can be determined by weighing
-The unit of comparison is called a mole and corresponds to 6.022x10^23
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