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67 .) Butyric acid, the molecule that causes the odor in rancid butter, contains only carbon,...

67 .) Butyric acid, the molecule that causes the odor in rancid butter, contains only carbon, hydrogen and oxygen. When 3.907 g of butyric acid are burned, the products of the combustion are 3.196 g of water and 7.807 g of carbon dioxide.  Determine the empirical formula for butyric acid.

_____ CxHyOz (l) + _____ O2 (g) → _____ CO2 (g) + _____ H2O (l) ____

a. How many moles of CO2 are produced?

b. How many moles of carbon were present in the butyric acid sample?

c. How many moles of H2O are produced?

d. How many moles of hydrogen were present in the butyric acid sample?

e. How many moles of oxygen were present in the butyric acid sample? (Hint: total mass of butyric acid = mass C + mass H + mass O)

f. What is the empirical formula of butyric acid?

g. The molar mass of butyric acid is 88.10 g/mol. What is the formula for butyric acid?

h. Complete the formula of butyric acid, above, and balance the reaction

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