Ch3 Example Problems

Ch3 Example Problems - 22 D) 1.32 10 23 E) 1.09 10 22 5) A...

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HODSON CHE 1301 Petrucci Ch3 Example Problems The following problems are taken from old exams . ..... 1) A 200.0 g sample of pure MgCl 2 contains: A) 1.204 × 10 26 formula units MgCl 2 B) 1.265 × 10 24 formula units MgCl 2 C) 95.211 formula units MgCl 2 D) 2.101 formula units MgCl 2 E) 5.734 × 10 25 formula units MgCl 2 2) A 10.0 g sample of bismuth tribromide, BiBr 3 , contains: A) 4.020 × 10 22 total number of ions B) 0.322 mol BiBr 3 C) 5.36 × 10 22 total number of ions D) 1.34 × 10 22 bromide ions E) 3.14 × 10 22 formula units BiBr 3 3) Crystals from evaporation of urine analyze to 22.6% phosphorus. Which compound is probably present? A) NaNH 4 HPO 4 B) (NH 4 ) 3 PO 4 C) Ca 3 (SO 4 ) 2 D) Na 3 PO 4 E) H 3 PO 4 4) How many hydrogen atoms are there in 12.4 g of Al 2 (HPO 4 ) 3 ? A) 6.07 × 10 22 B) 6.55 × 10 22 C) 4.39 × 10
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Unformatted text preview: 22 D) 1.32 10 23 E) 1.09 10 22 5) A strip of electrolytically pure copper weighing 3.178 grams is strongly heated in a stream of oxygen until it is all converted to a black oxide. The resultant black powder weighs 3.978 g. What is the empirical formula of the oxide? A) CuO 2 B) CuO C) CuO 3 D) Cu 2 O E) Cu 2 O 3 6) To produce ferrocene one requires 2.33 g of C 5 H 5 (65.0 g/mol) for every 1.00 g of Fe used (55.9 g/mol). What is the value of x in the formula of ferrocene: Fe(C 5 H 5 ) x ? A) 1 B) 5 C) 2 D) 3 E) 4 7) What is the mass percent of H 2 O in magnesium chloride hexahydrate? A) 8.86 % B) 53.2 % C) 26.6 % D) 64.4 % E) 10.7 %...
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This note was uploaded on 12/18/2009 for the course CHE 1301 taught by Professor Klausmeyer during the Spring '08 term at Baylor.

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Ch3 Example Problems - 22 D) 1.32 10 23 E) 1.09 10 22 5) A...

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