Help on empirical formula

  • Thread starter Kelly09
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  • #1
Kelly09
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Vitamin B5 is called niacin or nicotinic acid. Its percentage composition by mass is (58.4% Carbon) (4.09% Hydrogen) (25.99% Oxygen) and (11.38% Nitrogen). What is the empirical formula of vitamin B5?
 

Answers and Replies

  • #2
sjb-2812
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Assume you have 100g of niacin. From your percentages, what mass of carbon, hydrogen, nitrogen and oxygen do you have? How many moles of each?
 
  • #3
chemisttree
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And Niacin is Vitamin B3, BTW. Minor mistake that won't really affect your problem.
 

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