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    I understand the first two steps but I am absolutely confused when the last step is reached where the formula is completed by 'filling in the hydrogen atoms'. Where do these hydrogen atoms come from and how do I know how many to add????
    Thank you very much!!!!
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    A carbon atom can make 4 bonds, if these bonds are missing when you have filled in all the other groups- then they are bound to a hydrogen atom.
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    (Original post by GDL/LPC student)
    A carbon atom can make 4 bonds, if these bonds are missing when you have filled in all the other groups- then they are bound to a hydrogen atom.
    Thanks for your answer.
 
 
 
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