Assignment1Key(2pages) - K - ; CHEMISTRY 1907 Name: WJWME...

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Unformatted text preview: K - ; CHEMISTRY 1907 Name: WJWME Homework Assignment #1 Due: Monday, September 7 Show work fer full credit 1. Copper has two isotopes, 63GB. (69.09%), which has a mass of 62.93 u, and 650a (30.91%)5 which has a mass of 64.9278 u. How mam; f’3’Cu atoms are present in a 578 mg sample of pure naturally assuming copper? I _ (- _ I , S757 16' " MALE“ G‘Ollkmaiflbm CM 6 71017 0mm) = g ‘73.;«102f Who pm..._._ . “ ~ I ‘ r . J Imam) (93.5—qu im°ktm fooflwé CA ath 65cm 2. Fill in the bianks :0 complete the foilowing tabie: Symbol #ef #ef #of charge Pretons eEeetmns neutrons # me my 8 2— Siz U 14 o Ca1+ -;2'0 _;8 _20 2+ 2+ N3' .15 7 mo 5' 5+ 3. Assign oxidation states to each of the underlined and bolt} atoms in the following compounds: (a) $91012 CM“ Wm: ”‘ "' 3-1:“ _ W“ “toga? E‘m Wm ______ mygawk”...2:2} “mfaig; wwwwww MEETW #— """"" Yfiwfigérwajflw (h) $2.20 CV I (3) $05 C! 3}” W {i} 3303' (115% 4. A moiecuie is 40.684% carbon (C), 5.121% hydrogan (H), and 541.94% oxygen (0) by mass. (3) What is this moleouie’s empirical formula? C&\ {b} If the molecular mass of this molecule is I 18.089 g/mole, what is the moiecular fonnula‘? C(MHLLC) 2 3' 337.2,nu1ab w:2 mfg C X; 3 2 C {2.01:3 C Q1313]?! malt-H ) «r 5.02soeemfiH ._—_ M‘OOMLH '><L : Bra/Me H w L 007%} W)” '_,.... _ _. ,n ' . r r t . , Mmfiufl” @Z’mfic .2 [Mao x ; .Sfl‘INj 335:7). Och 2mm “~01”; C 3miu+ (WWW): $01335 H \WW— , ' t-c E'I- D 2. MO nicmqa '3 3L” 3 “" (will: M W. OqS’g/MVLL ...
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This note was uploaded on 11/22/2009 for the course CHEM 2070 taught by Professor Chirik,p during the Fall '05 term at Cornell University (Engineering School).

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Assignment1Key(2pages) - K - ; CHEMISTRY 1907 Name: WJWME...

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