Counting Atoms

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The document provides rules for counting atoms in chemical formulas including: using subscripts only for the atom behind it, multiplying coefficients and subscripts, and applying subscripts inside parentheses to all elements within. It then provides examples of using the rules to determine the number of each type of atom in sample formulas.

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RULES FOR COUNTING ATOMS ,[object Object],[object Object],[object Object]

COEFFICIENTS ,[object Object],[object Object],ATOMS OF HYDROGEN: ATOMS OF SULFUR: 4 2 IF THERE ISN’T A SUBSCRIPT BEHIND AN ELEMENT, ASSUME THERE IS ONLY ONE ATOM OF THAT ELEMENT!

PARENTHESES ,[object Object],Ba(OH) 2 ATOMS OF BARIUM: ATOMS OF OXYGEN: ATOMS OF HYDROGEN: 1 2 2

LET’S PRACTICE! ,[object Object],[object Object],[object Object],1 2 Al 2 S 3 Atoms of Aluminum: Atoms of Sulfur: 2 3

PRACTICE ,[object Object],[object Object],[object Object],[object Object],2 1 CH 3 OH Atoms of Carbon: Atoms of Hydrogen: Atoms of Oxygen: 1 4 4 1

THIS COULD BE A LITTLE TRICKY… ,[object Object],[object Object],[object Object],[object Object],3 2 Al 2 (SO 4 ) 3 Atoms of Aluminum: Atoms of Sulfur: Atoms of Oxygen: 2 3 8 12

What about this BAD BOY??? ,[object Object],[object Object],[object Object],[object Object],6 4 16

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Counting Atoms

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