CHEM practice probs

CHEM practice probs - A 1.500 g sample of a compound...

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1 ANS: C 2 H 4 O 3 A 1.500 g sample of a compound containing only C, H and O was burned completely to produce 1.738 g CO 2 and 0.711 g H 2 O. What is the empirical formula of the compound? If a 10.0 g sample of Zn(s) is treated with excess HCl, what volume of hydrogen gas is evolved at STP? Zn(s) + 2 HCl(aq) Æ ZnCl 2 (aq) + H 2 (g) ANS: 3.43 L
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2 Consider the reaction: 2Al(s) + 3Cl 2 (g) Æ 2AlCl 3 (s) How many grams of AlCl 3 are formed when 2.37 g Al react with 4.09 g Cl 2? ANS: 5.13 g AlCl 3 Which of the following substances would you expect to be a nonelectrolyte in aqueous solution? A. CH 3 CH 2 OH B. KI C. NH 3 D. HBr E. CH 3 COOH
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3 When aqueous Fe 2 (SO 4 ) 3 and aqueous LiOH are mixed, does a precipitate form? Yes. Fe(OH) 3 Write a balanced equation. Fe 2 (SO 4 ) 3 (aq) + 6LiOH (aq) Æ 2Fe(OH) 3 (s) + 3Li 2 SO 4 (aq) Write a net ionic equation and identify the spectator ions. 2Fe 3+ (aq) + 6OH - (aq) Æ 2Fe(OH) 3 (s) Spectator: SO 4 2- and Li + Calculate the molarity of Cl - in 245.0 mL of a solution containing 23.4 g BaCl 2 . ANS: 0.917 M
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What volume of 0.12 M FeCl 3 should be diluted to 442 mL to make a solution containing 0.074 M Cl - ? ANS: 90.9 mL
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This note was uploaded on 04/30/2010 for the course CHEM 101 taught by Professor Taracarpenter during the Spring '08 term at UMBC.

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CHEM practice probs - A 1.500 g sample of a compound...

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