exam2 2000

# exam2 2000 - 1 Calculate the molarity of Cl in 245.0 mL of...

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SG 161: E 2 V 1 1 FALL “00” 1. Calculate the molarity of Cl - in 245.0 mL of a solution containing 23.4 g BaCl 2 . A. 0.112 M B. 0.0275 M C. 0.459 M D 0.553 M E. 2.18 M 2. A system absorbs a given quantity of heat and does a given quantity of work. Which of the following choices correctly indicates the signs for q and w? 3. A 1.45 g sample of an iron ore is dissolved in acid and the iron obtained is Fe‚ 2+ (aq). To titrate the solution, 21.6 mL of 0.102 M KMnO“-(aq) is required. What is the percent of iron in the ore? 5 Fe 2+ + MnO 4 - + 8 H + -----> 5 Fe 3 + + Mn 2 + + 4 H 2 O 4. Calculate the density of ammonia gas, NH 3 , at 24 ° C and 738 torr. 5. Which of the following is incorrectly labeled? A. KCl - strong electrolyte B. HCl - strong electrolyte C. HCOOH - weak electrolyte D NH 3 - weak electrolyte E. HNO 2 - strong electrolyte

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SG 161: E 2 V 1 2 FALL “00” 6. Consider four identical 1.0-L flasks containing the following gases each at 0 ° C and 1 atm pressure. Which sample has the most molecules?
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