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Molecular Formula of a Compound

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1. What is the molecular formula of a compound? See attached file for full problem description.

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Let the formula be CxHyNzOt
MW = 12x+y+14z+16t
We have:
(1)
(2)
(3)
(4)

Take (1) divide by (2):

Take (1) divide by (3):
...

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