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Counting Atoms

This refresher guide simplifies the process of counting atoms in chemical formulas. Step-by-step examples cover molecular compositions such as H2O, Ca(OH)2, Mg3(PO4)2, and lead compounds, ensuring clarity in understanding subscripts and coefficients. You'll learn to calculate the total number of atoms in complex formulas like Pb(NO3)2 and much more. Plus, practical tips ensure accuracy without rushing through calculations. Ideal for students and anyone looking to reinforce their chemistry knowledge.

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Counting Atoms

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Presentation Transcript

  1. Counting Atoms No worries!

  2. Refresher… Subscript… = H+H = H+H+O = H+H+S+O+O+O+O

  3. Refresher… = Ca+(O+H)+(O+H) Ca+O+O+H+H

  4. Refresher… = H+H+O+H+H+O

  5. Try this… = = = = Mg=3 P=2 O=8 3+2+8= 13 Atoms in

  6. Try this… = = = (Pb+(N+O+O+O)+(N+O+O+O))+(Pb+(N+O+O+O)+(N+O+O+O))+ (Pb+(N+O+O+O)+(N+O+O+O))+(Pb+(N+O+O+O)+(N+O+O+O))= Or Pb+N+O+O+O+N+O+O+O+Pb+N+O+O+O+N+O+O+O+Pb+N+O+O+O+N+O+O+O+Pb+N+O+O+O+N+O+O+O= Pb=4 N=8 O=24 4+8+24=36 total atoms

  7. Now you are ready to do it on your own!!! Easy to do… just don’t rush your work!

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