CHEM 1127Q Lecture Notes - Lecture 10: Chemical Formula, Molar Mass, Royal Aircraft Factory F.E.2
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Chem 1127q - lecture 10 notes - exam 1 review (ch. Q: find the percent composition of fe in the compound fe2o3. A: % fe = mass of fe mass of compound (fe2o3) Because there"s 2 moles of fe, we multiply the molar mass of fe by 2. Q: the mystery metal is signified by m". A: if oxygen is composed of 30. 06% of the compound then 100% - 30. 06% = 69. 69% is composed of the mystery metal. 0. 3006 of o = mass of o mass of m2o3. Use algebra to isolate mass of m2o3 : 0. 6969 of m = mass of m mass of m2o3 mass of m. Mass of m = 55. 84 g look in periodic table and find the corresponding element with this mass and plug into mystery compound. Q: cxhy weighs 12. 01 g contains 0. 21945 mols. Find the molecular weight of hydrogen and carbon in the compound using the percent composition.
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