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Unformatted text preview: An analysis of a 100.0 gram sample of a fat showed it contained: 76.5 % C, 11.3 % O, and balance H. The molar mass of the fat was 1,128.0 grams/mole. Emp/Formula: ________ Emp/Mass: ________ Emp/Units: ____ Molecular Formula: _________ 6. A compound contains 54.53% carbon, 9.15% hydrogen, and 36.32% oxygen. How many hydrogen atoms are in the empirical formula ? 7. Of the following formulas circle the empirical formula is: a) N 2 F 2 b) N 2 F 4 c) H 2 C 2 d) H 2 N 2 e) HNO 3 d) O 4 F 8 g) NO 2 8. A 27.0 gram sample of an unknown carbon-hydrogen compound was burned in excess oxygen to form 88.0 grams of CO 2 and 27.0 grams H 2 O. What is molecular formula of the carbon-hydrogen compound ? 9. An unknown element Z combines with oxygen to form the compound ZO 2 . If 58.0 grams of element Z combines exactly with 32.0 oxygen, what is the molar mass of element Z ? Jpechunf220007...
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