Fence and rail (3 problems) picture in attachment.

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Miller13
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I honestly don't remember the teacher teaching this but I need help with.

I attached image of #8, and #9Only those 2^
 

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No idea what the fence and rail method is, but I suppose it was explained earlier in the book. Other than that, these are simple stoichiometry problems.
 
Would you help me set up mass to mass?