Transcription of #18 Notes Unit 3: Stoichiometry - Chemistry Notes …
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#18 Notes Unit 3: Stoichiometry - Chemistry Notes …
2011 #18 Notes unit 3: Stoichiometry Ch. continued III. Percent Composition Ex. 1) Find the % composition of (NH4)2C4H4O4 2 N = 2 ( g) = g N 8+4= 12 H = 12 ( g) = g H 4 C = 4 ( g) = g C 4 O = 4( g) = g O g (molar mass) % N = mass of N X 100 = g X 100 = % N Keep 3 or 4 digits! molar mass g % H = mass of H X 100 = g X 100 = % H molar mass g % C = mass of C X 100 = X 100 = % C molar mass g % O = mass of O X 100 = X 100 = % O molar mass g = 100% Ex.
(react in the reaction) (are produced/formed in the reaction) aq = aqueous, s = solid, cr = crystalline solid, l = liquid, g = gas . Steps:
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