61E-Formula-Prob

61E-Formula-Prob - An analysis of a 100.0 gram sample of a...

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EMPIRICAL FORMULA GCHEM I CONCEPT LAB PROBLEMS 1. A magnesium compound ( MM 300.0 grams/mole) contains 72.2% Mg and 27.8% N. Emp/Formula: ________ Emp/Mass: _______ Emp/Units: ____ Molecular Formula: _________ 2. A compound was analyzed and found to contains 42.05 grs Nitrogen (N) and 95.95 grs Oxygen (O). The molar mass of compound was 230.0 grams/mole. Emp/Formula: _________ Emp/Mass: ______ Emp/Units: ____ Molecular Formula: __________ 3. Sample of a sulfur and oxygen compound was isolated in oil. The compound ( MM 192.0 grams/mole) was analyzed and found to contain 50.1% S and 49.9% O. Emp/Formula: ________ Emp/Mass: _______ Emp/Units: ____ Molecular Formula: __________ 4. A simple sugar contains 0.0406 grams C, 0.00681 grams H, and 0.0540 grams O. The molar mass of the compound is 180.0 grams/mole. Emp/Formula: _______ Emp/Mass: _______ Emp/Units: ____ Molecular Formula: ___________ 5. Fats are used in the manufacturing soap compounds.

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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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This note was uploaded on 07/28/2011 for the course CHM 2045 taught by Professor Eng during the Spring '10 term at UNF.

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61E-Formula-Prob - An analysis of a 100.0 gram sample of a...

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