20219 - Chemistry Practice Problems #3 1. Determine the...

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Chemistry Practice Problems #3 1. Determine the percent of nitrogen by mass in the following compounds: (a) S 4 N 4 , (b) Mn(NO 3 ) 2 , (c) CH 3 NH 2 . 2. Calculate the formula weights of the following compounds or ions: (a) H 2 SO 4 , (b) BF 3 O(C 2 H 5 ) 2 , (c) CaCO 3 , (d) [Fe(CN) 6 ] 3 - , (e) RuCl 3 , (f) HOCH 2 CH 2 OH, (g) CH 3 COOH. 3. Calculate the following: (a) number of O atoms in 0.625 mol of Cr(NO 3 ) 3 (b) number of molecules in 0.009567 mol of HBrO 3 (c) number of molecules in 0.04061 mol of CH 3 OH (d) number of mol of SO 3 in 6.844 grams of SO 3 (e) number of mol of PbCl 2 in 100.0 grams of PbCl 2 (f) mass in grams of 0.04357 mol of C 6 H 5 CF 3 (g) mass in grams of 1.505 mol of AsH 3 . 4. What is the molar mass of aspirin if 0.12345 mol of aspirin weighs 22.241 g? 5. What is the mass, in grams, of 7.92 x 10 20 molecules of Vitamin C? (Vitamin C, C 6 H 8 O 6 .) 6. Find the empirical formula for a compound composed entirely of 5.28 g of Sn, and 3.37 g of F. 7. Find the empirical formula for a compound containing only 0.104 mol K, 0.052 mol C, and 0.156 mol O. 8.
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This note was uploaded on 04/03/2011 for the course CHEM 112 taught by Professor Harwood during the Spring '11 term at Purdue.

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20219 - Chemistry Practice Problems #3 1. Determine the...

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