A 575 g b 672 g c 863 g d 460 g e 920 g oh d4 2018 ls

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(A) 5.75 g (B) 6.72 g (C) 8.63 g (D) 46.0 g (E) 92.0 g ࠵?. ࠵?࠵?࠵? ࠵? × ࠵?. ࠵?࠵?࠵? ࠵?࠵?࠵? ࠵? ࠵? × ࠵?࠵?࠵?. ࠵?࠵? ࠵? ࠵? ࠵?࠵?࠵? = ࠵?. ࠵?࠵? ࠵? OH
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D4 © 2018 L.S. Brown (5 pts) 10. A beaker containing 100.0 mL of 1.00 M NaCl(aq) is left in a laboratory fume hood. After several days the concentration has risen to 1.25 M. How much water must have evaporated from the original solution? (Evaporation will remove only H 2 O, not any of the NaCl.) (A) 75.0 mL (B) 25.0 mL (C) 20.0 mL (D) 80.0 mL (E) 33.3 mL Concentration increases by factor of 5/4, so volume decreases by factor of 4/5. (5 pts) 11. What volume of 0.320 M HCl would be needed to completely neutralize 50.0 mL of 0.0400 M Ba(OH) 2 in an acid-base titration? (A) 3.13 mL (B) 6.25 mL (C) 18.0 mL (D) 24.0 mL (E) 12.5 mL 2 HCl + Ba(OH) 2 ® 2 H 2 O + BaCl 2 ࠵?. ࠵?࠵?࠵? ࠵? × ࠵?. ࠵?࠵? ࠵?࠵?࠵? ࠵?࠵?(࠵?࠵?) ࠵? ࠵? ࠵? × ࠵? ࠵?࠵?࠵? ࠵?࠵?࠵? ࠵? ࠵?࠵?࠵? ࠵?࠵?(࠵?࠵?) ࠵? × ࠵? ࠵? ࠵?. ࠵?࠵? ࠵?࠵?࠵? ࠵?࠵?࠵? = ࠵?. ࠵?࠵?࠵?࠵? ࠵? = ࠵?࠵?. ࠵? ࠵?࠵? (5 pts) 12. Ammonia is formed from the reaction of H 2 and N 2 . 3 H 2 (g) + N 2 (g) ® 2 NH 3 (g) Which of the following reactant mixtures could produce the greatest amount of product? (Assume that the reaction goes to completion with 100% yield.) (A) 1 mol H 2 and 6 mol N 2 (B) 4 mol H 2 and 2 mol N 2 (C) 2 mol H 2 and 4 mol N 2 (D) 3 mol H 2 and 3 mol N 2 (E) 5 mol H 2 and 1 mol N 2 This is a limiting reactant question. Moles of NH 3 produced would be 2/3, 8/3, 4/3, 2, and 2, repectively for A – E.
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NAME:______________________________________ © 2018 L.S. Brown D5 Use the following information to answer questions 13 & 14. Pb(NO 3 ) 2 , KI, and KNO 3 are all strong electrolytes. When solutions of KI and Pb(NO 3 ) 2 are mixed, they react according to the following equation. Pb(NO 3 ) 2 (aq) + 2 KI(aq) ® PbI 2 (s) + 2 KNO 3 (aq) (4 pts) 13. A molecular scale illustration representing the two reactant solutions is shown below. Which of the following pictures best represents the expected products when the two solutions shown above are mixed? (4 pts) 14. Which species act only as spectator ions in this reaction?
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